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Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations

From: Peter Lieven
Subject: Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations
Date: Mon, 25 Mar 2013 11:17:15 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 
On 22.03.2013 22:24, Paolo Bonzini wrote:

Il 22/03/2013 20:20, Peter Lieven ha scritto:

I think patch 4 is a bit overengineered.  I would prefer the simple
patch you had using three/four non-vectorized accesses.  The setup cost
of the vectorized buffer_is_zero is quite high, and 64 bits are just
256k RAM; if the host doesn't touch 256k RAM, it will incur the overhead.

I think you are right. I was a little to eager to utilize 
buffer_find_nonzero_offset()
as much as possible. The performance gain by unrolling was impressive enough.
The gain by the vector functions is not that big that it would justify a 
possible
slow down by the high setup costs. My testings revealed that in most cases 
buffer_find_nonzero_offset()
returns 0 or a big offset. All the 0 return values would have increased setup 
costs with
the vectorized version of patch 4.


I would prefer some more benchmarking for patch 5, but it looks ok.

What would you like to see? Statistics how many pages of a real system
are not zero, but zero in the first sizeof(long) bytes?

Yeah, more or less.  Running the system for a while, migrating, and
plotting a histogram of the return values of buffer_find_nonzero_offset
(hmm, perhaps using a nonvectorized version is better for this experiment).


It seems that Paolos concern regarding only checking the first 64-bit where 
right. What I would propose is
to check the first BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR * sizeof(VECTYPE) 
bytes in
sizeof(VECTYPE) chunks and use the unrolled version afterwards.

basically this would result in sth like this:

size_t buffer_find_nonzero_offset(const void *buf, size_t len)
{
    VECTYPE *p = (VECTYPE *)buf;
    VECTYPE zero = ZERO_SPLAT;
    size_t i;

    assert(can_use_buffer_find_nonzero_offset(buf, len));

    if (!len) {
        return 0;
    }

    for (i = 0; i < BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR; i++) {
        if (!ALL_EQ(p[i], zero)) {
            return 0;
        }
    }

    for (i = BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR;
            i < len / sizeof(VECTYPE);
            i += BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR) {
        VECTYPE tmp0 = p[i + 0] | p[i + 1];
        VECTYPE tmp1 = p[i + 2] | p[i + 3];
        VECTYPE tmp2 = p[i + 4] | p[i + 5];
        VECTYPE tmp3 = p[i + 6] | p[i + 7];
        VECTYPE tmp01 = tmp0 | tmp1;
        VECTYPE tmp23 = tmp2 | tmp3;
        if (!ALL_EQ(tmp01 | tmp23, zero)) {
            break;
        }
    }

    return i * sizeof(VECTYPE);
}

this version is approx. 1-2% slower than the first one, but still 15% faster 
than old is_dup_page() for zero pages.
BUT, if the first 8 bytes are zero and afterwards non-zero, the first version 
is approx. 200% slower due to
the high setup costs.

Paolo, with this one maybe you would also be fine witht he vectorized version 
of patch 4?

Peter

---

here are the results of the tests with the return values of 
buffer_find_nonzero_offset (64-bit chunks):

ubuntu 12.04 LTS 64-bit desktop with 1G memory shortly after boot:
return values: 83905 3281 1169 448 412 212 284 180 146 93 54 77 64 44 48 50 68 46 28 62 40 81 34 69 52 47 31 21 35 29 39 24 83 43 22 17 10 37 30 10 17 23 12 12 12 17 9 23 12 20 2 9 22 16 16 64 15 39 8 9 7 12 8 10 10 13 8 12 58 10 7 8 18 18 10 12 11 6 9 16 9 60 5 6 7 7 5 12 98 32 7 9 4 11 7 6 11 4 11 45 7 19 4 6 6 13 5 8 5 14 7 5 11 6 3 8 12 8 3 12 10 23 11 5 9 3 10 13 46 6 2 14 7 7 4 11 9 4 1 9 5 10 4 6 14 62 5 10 106 6 7 7 6 26 3 34 80 8 12 12 8 5 2 6 7 14 5 8 8 8 7 3 6 16 4 13 16 9 4 14 6 22 14 15 6 25 4 12 6 6 3 7 13 11 5 11 3 11 8 5 16 12 2 5 3 8 4 3 11 62 147 9 54 20 14 3 5 28 12 3 6 5 7 2 9 9 10 8 11 4 4 6 10 7 20 5 4 1 6 9 6 7 9 2 2 6 5 10 3 23 5 13 6 7 20 11 12 15 17 2 4 2 3 25 2 6 3 15 4 6 5 30 15 9 4 28 3 4 6 5 6 18 7 2 9 2 2 9 8 11 8 1 4 5 4 4 2 4 6 75 9 8 6 5 3 6 3 6 15 5 5 5 6 20 6 10 7 9 6 4 9 5 6 6 9 7 5 5 5 4 4 1 46 6 10 10 92 4 7 3 3 32 6 7 34 30 2 8 2 7 8 5 9 8 4 21 9 9 12 5 12 5 3 5 5 5 65 4 4 67 7 7 5 8 7 1 3 3 5 7 4 7 7 7 15 15 8 11 5 6 2 7 12 6 5 9 13 2 19 6 2 8 3 11 8 9 38 1 7 1 20 11 5 7 1 4 6 5 4 2 2 7 5 5 2 51 5 4 9 7 4 16 3 67 7 45 9 8 9 12 38 11 6 14 2 2 10 10 6 10 4 9 9 5 4 7 2 8 7 4 5 1 2 2 6 3 5 4 7 0 2 6 5 13 5 5 4 11 4 4 9 4 2 8 10 5 6 10 6 4 2 2 6 4 6 3 4 7 5 7 0 6 4 5 4 1 8 11 15 15 14 20 168432
histogram: 31.7% 32.9% 33.3% 33.5% 33.7% 33.7% 33.9% 33.9% 34.0% 34.0% 34.0% 34.1% 34.1% 34.1% 34.1% 34.1% 34.2% 34.2% 34.2% 34.2% 34.2% 34.3% 34.3% 34.3% 34.3% 34.3% 34.3% 34.4% 34.4% 34.4% 34.4% 34.4% 34.4% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.5% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.6% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 35.9% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.0% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.1% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.2% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.3% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 36.4% 100.0% 

---

opensuse 11.1 64-bit with 24GB ram (busy server)
return values: 7279752 30276 15074 8523 6218 4882 3998 2940 19212 1887 1408 1123 892 670 507 673 1284 362 306 214 201 760 232 148 1062 129 266 102 661 101 116 112 911 88 86 74 174 149 70 98 627 77 632 190 115 466 85 72 545 88 92 99 87 114 127 79 379 91 190 739 93 67 178 614 294 60 149 470 84 70 35 76 179 124 58 264 72 81 59 56 295 102 343 65 73 201 174 53 206 153 278 123 88 98 42 86 127 61 62 52 90 51 110 67 148 43 62 62 112 65 339 44 235 324 60 67 86 47 138 50 687 165 64 40 65 60 665 55 326 111 64 52 43 60 149 48 444 42 33 65 117 157 70 43 219 53 181 46 177 38 125 45 95 56 189 553 204 39 76 49 88 85 730 38 109 44 895 120 241 45 44 41 51 33 35 44 357 49 39 71 28 694 263 43 104 43 45 34 35 47 153 44 233 44 31 55 40 27 547 47 264 33 36 30 33 39 38 33 105 200 42 47 41 40 25 34 109 44 28 33 45 31 47 30 117 166 36 30 199 30 160 41 168 101 40 28 92 45 42 33 53 53 31 46 30 42 32 32 57 44 38 39 25 50 49 49 1392 30 157 294 35 58 36 35 45 38 29 32 32 31 36 27 61 42 24 31 35 85 61 26 43 19 35 36 26 26 87 33 34 34 37 31 28 39 35 27 131 20 30 35 27 31 24 33 39 41 21 32 26 32 17 18 38 21 163 39 30 29 29 20 40 43 26 39 24 39 23 19 38 48 38 33 99 21 142 57 46 39 50 31 26 37 44 28 42 23 29 63 413 27 22 22 125 30 24 348 34 46 43 40 39 34 25 145 15 26 14 32 39 29 22 26 23 31 11 29 159 215 19 77 41 24 85 42 46 23 19 59 24 32 18 83 146 24 22 22 32 32 20 25 32 30 16 27 36 26 24 22 30 31 15 27 27 33 15 23 27 16 27 29 173 38 34 39 451 17 30 24 26 77 18 21 29 22 24 157 26 29 19 24 38 30 32 35 18 37 20 16 53 97 23 25 24 29 31 27 36 21 20 26 22 29 13 26 27 35 21 10 11 26 17 28 30 16 29 33 34 45 25 7 29 31 21 14 21 28 17 17 53 16 9 20 26 17 13 11 15 32 25 32 32 26 16 20 10 24 31 25 46 33 42 47 38201 

histogram:
97.5% 97.9% 98.1% 98.3% 98.3% 98.4% 98.5% 98.5% 98.8% 98.8% 98.8% 98.8% 98.8% 98.8% 98.8% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 98.9% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.0% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.1% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.2% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.3% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.4% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 99.5% 100.0% 

---

windows server 2008 R2 with 8G ram running for 3 days:
return values: 440570 8602 1952 1424 678 728 518 517 562 439 316 723 247 280 235 320 351 263 300 207 186 177 113 170 147 186 90 151 56 146 62 145 181 97 64 114 66 114 49 91 109 77 70 82 52 88 76 146 98 70 47 83 62 91 41 57 86 81 40 68 47 73 30 58 136 83 18 45 38 45 17 86 36 80 247 301 27 75 20 55 93 51 32 38 42 41 16 41 54 50 29 40 41 303 15 61 80 42 19 25 13 29 15 33 24 52 18 42 19 28 16 28 109 16 25 43 30 31 13 40 22 24 18 34 10 20 43 27 62 19 18 22 12 33 17 23 24 14 12 23 14 22 24 26 44 33 20 21 23 22 25 26 54 18 16 25 16 23 9 22 76 20 11 30 6 24 17 16 32 23 8 18 7 20 8 28 65 11 18 15 20 15 11 9 25 19 16 18 12 14 12 12 53 25 13 24 18 17 7 20 7 29 18 34 19 21 13 13 69 32 23 22 14 26 8 20 22 27 15 31 8 23 16 18 47 34 14 39 43 15 13 14 32 22 8 40 13 22 8 22 25 19 13 15 9 13 10 17 11 19 18 22 20 13 6 15 98 15 12 12 16 17 13 13 46 15 6 29 10 19 12 17 38 9 8 15 14 19 5 17 9 16 13 14 9 14 13 18 51 22 13 12 11 105 12 20 15 21 8 12 13 12 5 13 54 23 24 34 9 19 48 11 26 18 7 19 8 22 10 4 56 21 11 18 12 11 10 14 13 12 9 12 17 11 6 14 47 26 21 19 16 13 6 12 23 20 24 22 6 8 1 7 48 10 16 6 17 10 9 12 12 4 12 5 20 31 6 7 39 27 6 57 4 5 9 9 5 9 4 11 5 13 5 7 32 3 7 13 7 12 4 18 15 15 9 12 10 18 7 11 25 8 6 20 17 17 4 9 19 18 11 6 7 12 7 8 36 12 7 12 7 15 10 11 15 11 12 24 20 13 10 10 42 14 5 10 9 15 5 14 12 14 10 12 4 37 8 11 27 11 10 30 7 8 8 21 22 14 16 13 15 18 19 12 53 17 15 16 5 12 5 13 92 15 8 18 6 13 26 27 109 10 8 10 6 15 11 12 15 13 12 12 15 9 14 12 89 7 11 15 10 16 7 18 24 179 13 58 48 47 28 68 1632222
histogram: 20.9% 21.3% 21.4% 21.5% 21.5% 21.6% 21.6% 21.6% 21.6% 21.7% 21.7% 21.7% 21.7% 21.7% 21.7% 21.8% 21.8% 21.8% 21.8% 21.8% 21.8% 21.8% 21.8% 21.8% 21.8% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 21.9% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.0% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.1% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.2% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.3% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.4% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 22.5% 100.0% 

---

windows XP guest with 1G Ram running for approx. 1 hours
return values: 71567 1377 21943 339 422 132 134 110 151 56 72 53 72 49 66 40 90 55 32 57 54 25 53 30 38 21 29 27 61 13 23 67 79 23 20 19 18 22 16 12 12 19 182 11 8 11 11 11 17 21 5 5 4 10 6 4 11 8 11 15 11 5 4 10 41 5 13 7 9 2 23 10 18 43 6 6 6 2 14 5 33 5 6 5 9 2 6 3 5 4 3 10 5 2 4 2 43 6 2 4 7 4 4 5 5 14 5 5 4 7 2 3 20 4 3 1 3 21 5 4 7 3 3 1 0 1 14 6 84 8 6 5 21 4 6 2 3 9 4 1 4 0 0 1 12 7 4 9 2 8 2 0 4 4 3 10 3 4 1 2 15 0 1 2 0 5 0 2 7 18 4 8 1 5 9 0 3 1 1 2 2 1 9 3 4 1 2 1 0 3 1 1 18 1 2 2 2 0 7 3 3 0 0 6 3 2 1 0 27 1 0 1 3 1 2 2 8 4 0 1 0 9 0 2 12 0 1 3 2 5 1 1 2 2 3 3 18 3 12 6 60 3 1 0 7 11 2 1 16 1 1 1 16 2 6 1 49 4 1 54 0 2 0 1 1 3 1 2 3 0 1 0 18 1 0 1 2 0 2 1 1 3 0 1 1 2 0 0 14 4 15 0 0 7 6 0 12 2 0 3 1 0 1 1 5 0 1 2 3 1 1 0 2 2 0 2 1 0 1 3 9 2 3 2 1 0 5 2 2 1 1 0 2 3 2 0 3 0 0 2 0 0 2 1 3 0 0 3 3 2 1 0 26 0 2 4 2 2 5 3 1 2 1 2 2 3 4 3 11 4 2 1 1 4 4 3 3 2 1 3 5 3 1 2 14 3 2 3 14 2 1 2 3 10 4 1 4 2 1 4 21 8 4 1 2 1 1 2 10 3 3 2 4 4 2 4 18 3 5 9 4 3 3 7 6 4 1 3 5 1 3 3 29 2 2 1 2 2 6 1 5 1 2 1 4 1 0 0 6 1 2 2 2 1 5 3 0 0 3 2 0 2 4 0 14 0 8 1 2 0 0 0 0 2 0 3 4 5 1 2 12 3 6 3 3 0 1 3 0 1 1 2 4 2 0 0 7 1 3 0 1 2 1 0 2 4 2 1 4 7 7 0 179427
histogram: 25.6% 26.1% 34.0% 34.1% 34.2% 34.3% 34.3% 34.4% 34.4% 34.4% 34.5% 34.5% 34.5% 34.5% 34.6% 34.6% 34.6% 34.6% 34.6% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.7% 34.8% 34.8% 34.8% 34.8% 34.8% 34.8% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 34.9% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.1% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.2% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.3% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.4% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.5% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.6% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.7% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 35.8% 100.0% 


Peter



Paolo



--

Mit freundlichen Grüßen

Peter Lieven

...........................................................

  KAMP Netzwerkdienste GmbH
  Vestische Str. 89-91 | 46117 Oberhausen
  Tel: +49 (0) 208.89 402-50 | Fax: +49 (0) 208.89 402-40
  address@hidden | http://www.kamp.de

  Geschäftsführer: Heiner Lante | Michael Lante
  Amtsgericht Duisburg | HRB Nr. 12154
  USt-Id-Nr.: DE 120607556

...........................................................
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