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Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU |
Date: |
Wed, 15 Oct 2008 15:10:05 +0200 |
Hi,
I made some tests on my system.
Intel Xeon, 2 GB RAM
Disk SATA 80 GB, using 4 GB Partitions
my guests are:
qemu/x86_64-softmmu/qemu-system-x86_64 -hda ../victory.qcow2 -drive
file=/dev/sdc1,if=virtio,cache=on -net
nic,model=virtio,macaddress=52:54:00:12:34:71 -net tap -serial stdio -m 512
-nographic
qemu/x86_64-softmmu/qemu-system-x86_64 -hda ../valkyrie.qcow2 -drive
file=/dev/sdc2,if=virtio,cache=on -net
nic,model=virtio,macaddress=52:54:00:12:34:72 -net tap -serial stdio -m 512
-nographic
I use the fio command given by Ryan with a 5 GB dataset (bigger than
host RAM).
Results follow.
baremetal
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 59.86 | 4.29 | 20.25 |
write,64k | 59.87 | 7.65 | 80.99 |
write,1M | 59.87 | 14935.89 | 1280.71 |
---------------+-------+----------+----------+
read,16k | 59.87 | 3.98 | 20,24 |
read,64k | 59.88 | 8.19 | 80.98 |
read,1M | 59.85 | 14959.63 | 1280.55 |
---------------+-------+----------+----------+
one guest, cache=on
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 59.35 | 44.64 | 20.38 |
write,64k | 53.40 | 70.87 | 90.72 |
write,1M | 54.81 | 18963.69 | 1395.37 |
---------------+-------+----------+----------+
read,16k | 35.62 | 7.84 | 34.02 |
read,64k | 34.27 | 11.86 | 141.48 |
read,1M | 17.50 | 59689.95 | 4344.10 |
---------------+-------+----------+----------+
one guest, cache=off
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 59.31 | 4.44 | 20.43 |
write,64k | 14.90 | 11.54 | 325.49 |
write,1M | 23.37 | 44683.35 | 3255.03 |
---------------+-------+----------+----------+
read,16k | 59.00 | 4.41 | 20.54 |
read,64k | 13.04 | 11.84 | 371.80 |
read,1M | 17.79 | 58712.11 | 4277.20 |
---------------+-------+----------+----------+
one guest, cache=on, O_DSYNC
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 54.44 | 13.07 | 22.25 |
write,64k | 54.19 | 13.10 | 89.48 |
write,1M | 58.77 | 17763.85 | 1295.22 |
---------------+-------+----------+----------+
read,16k | 35.27 | 7.83 | 34.36 |
read,64k | 33.59 | 11.74 | 144.36 |
read,1M | 17.44 | 59856.18 | 4357.69 |
---------------+-------+----------+----------+
two guests, cache=on
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 19.20 | 36.83 | 63.11 |
| 18.90 | 35.06 | 64.10 |
write,64k | 18.22 | 62.46 | 266.09 |
| 17.68 | 61.64 | 274.89 |
write,1M | 17.18 | 60442.52 | 4454.48 |
| 17.11 | 61137.82 | 4424.15 |
---------------+-------+----------+----------+
read,16k | 16.32 | 8.19 | 74.25 |
| 20.62 | 7.17 | 58.77 |
read,64k | 13.02 | 14.05 | 372.35 |
| 13.47 | 14.60 | 359.95 |
read,1M | 7.68 |135632.60 | 9909.40 |
| 7.62 |137367.63 | 9985.99 |
---------------+-------+----------+----------+
two guests, cache=off
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 26.39 | 7.08 | 45.58 |
| 26.40 | 8.33 | 45.90 |
write,64k | 8.08 | 12.77 | 599.79 |
| 8.09 | 12.87 | 599.59 |
write,1M | 10.27 |101694.60 | 7410.92 |
| 10.28 |101513.20 | 7405.89 |
---------------+-------+----------+----------+
read,16k | 42.36 | 4.60 | 28.60 |
| 27.96 | 14.56 | 43.31 |
read,64k | 5.84 | 13.31 | 830.94 |
| 5.83 | 22.27 | 830.62 |
read,1M | 7.82 |133631.63 | 9730.10 |
| 7.82 |133351.59 | 9725.79 |
---------------+-------+----------+----------+
two guests, cache=on, O_DSYNC
| MB/s | avg sub | avg comp |
| | lat (us) | lat (ms) |
---------------+-------+----------+----------+
write,16k | 19.77 | 17.36 | 61.29 |
| 19.73 | 6.36 | 61.43 |
write,64k | 23.10 | 14.00 | 209.94 |
| 36.25 | 14.51 | 25.22 |
write,1M | 23.94 | 43704.88 | 3146.77 |
| 36.68 | 28456.63 | 2073.53 |
---------------+-------+----------+----------+
read,16k | 16.38 | 8.04 | 73.99 |
| 20.08 | 6.88 | 60.38 |
read,64k | 11.39 | 15.22 | 425.61 |
| 11.50 | 14.97 | 421.55 |
read,1M | 7.68 |135693.24 | 9914.71 |
| 7.61 |137409.27 | 9984.48 |
---------------+-------+----------+----------+
--
------------------ address@hidden ------------------
"Tout ce qui est impossible reste à accomplir" Jules Verne
"Things are only impossible until they're not" Jean-Luc Picard
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, (continued)
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/13
- [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Ryan Harper, 2008/10/13
- [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Anthony Liguori, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Ryan Harper, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Ryan Harper, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU,
Laurent Vivier <=
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/16
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Anthony Liguori, 2008/10/16
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/16
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/17
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/17
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Kevin Wolf, 2008/10/14
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Ryan Harper, 2008/10/14
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/14
Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Mark Wagner, 2008/10/13