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[Qemu-devel] [question] virtio-blk performance degradation happened with
From: |
Zhang Haoyu |
Subject: |
[Qemu-devel] [question] virtio-blk performance degradation happened with virito-serial |
Date: |
Fri, 29 Aug 2014 15:45:30 +0800 |
Hi, all
I start a VM with virtio-serial (default ports number: 31), and found that
virtio-blk performance degradation happened, about 25%, this problem can be
reproduced 100%.
without virtio-serial:
4k-read-random 1186 IOPS
with virtio-serial:
4k-read-random 871 IOPS
but if use max_ports=2 option to limit the max number of virio-serial ports,
then the IO performance degradation is not so serious, about 5%.
And, ide performance degradation does not happen with virtio-serial.
[environment]
Host OS: linux-3.10
QEMU: 2.0.1
Guest OS: windows server 2008
[qemu command]
/usr/bin/kvm -id 1587174272642 -chardev
socket,id=qmp,path=/var/run/qemu-server/1587174272642.qmp,server,nowait -mon
chardev=qmp,mode=control -vnc :0,websocket,to=200 -enable-kvm -pidfile
/var/run/qemu-server/1587174272642.pid -daemonize -name win2008-32 -smp
sockets=1,cores=1 -cpu core2duo -nodefaults -vga cirrus -no-hpet -k en-us -boot
menu=on,splash-time=8000 -m 2048 -usb -drive
if=none,id=drive-ide0,media=cdrom,aio=native -device
ide-cd,bus=ide.0,unit=0,drive=drive-ide0,id=ide0,bootindex=200 -drive
file=/sf/data/local/images/host-00e081de43d7/cea072c4294f/win2008-32.vm/vm-disk-1.qcow2,if=none,id=drive-ide2,cache=none,aio=native
-device ide-hd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=100 -netdev
type=tap,id=net0,ifname=158717427264200,script=/sf/etc/kvm/vtp-bridge -device
e1000,mac=FE:FC:FE:D3:F9:2B,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300
-rtc driftfix=slew,clock=rt,base=localtime -global
kvm-pit.lost_tick_policy=discard -global PIIX4_PM.disable_s3
=1 -global PIIX4_PM.disable_s4=1
Any ideas?
Thanks,
Zhang Haoyu
- [Qemu-devel] [question] virtio-blk performance degradation happened with virito-serial,
Zhang Haoyu <=