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Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-t
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling |
Date: |
Wed, 17 Feb 2010 10:46:10 +0100 |
On 17.02.2010, at 10:42, OHMURA Kei wrote:
>>>> "We think"? I mean - yes, I think so too. But have you actually measured
>>>> it?
>>>> How much improvement are we talking here?
>>>> Is it still faster when a bswap is involved?
>>> Thanks for pointing out.
>>> I will post the data for x86 later.
>>> However, I don't have a test environment to check the impact of bswap.
>>> Would you please measure the run time between the following section if
>>> possible?
>> It'd make more sense to have a real stand alone test program, no?
>> I can try to write one today, but I have some really nasty important bugs to
>> fix first.
>
>
> OK. I will prepare a test code with sample data. Since I found a ppc
> machine around, I will run the code and post the results of
> x86 and ppc.
>
>
> By the way, the following data is a result of x86 measured in QEMU/KVM.
> This data shows, how many times the function is called (#called), runtime of
> original function(orig.), runtime of this patch(patch), speedup ratio (ratio).
That does indeed look promising!
Thanks for doing this micro-benchmark. I just want to be 100% sure that it
doesn't affect performance for big endian badly.
Alex
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, (continued)
- [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Anthony Liguori, 2010/02/10
- [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, OHMURA Kei, 2010/02/11
- [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Avi Kivity, 2010/02/14
- [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, OHMURA Kei, 2010/02/15
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Alexander Graf, 2010/02/15
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, OHMURA Kei, 2010/02/16
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Alexander Graf, 2010/02/16
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, OHMURA Kei, 2010/02/17
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling,
Alexander Graf <=
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, OHMURA Kei, 2010/02/18
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Alexander Graf, 2010/02/18
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Avi Kivity, 2010/02/17
- Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Alexander Graf, 2010/02/17
[Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling, Ulrich Drepper, 2010/02/10