[Qemu-devel] 答复: question about perfor mance of dataplane

[Zhangleiqiang]

Hi, Stefan:

        I have also finished the perf testing under Fedora 17 using IOZone, and 
the results also shown that the performance of disk with dataplane enabled did 
not have advantage over non-dataplane.

1. Environment:
        a). Qemu 1.4 master branch
        b). kernel:  3.5.0-2.fc17.x86_64
    c). virtual disks location:  the same local SATA harddisk with ext4 fs
        d). VM start cmd (os: fedora17/raw, disk1: raw/non-dataplane/10G, 
disk2: raw/dataplane/10G) :

./x86_64-softmmu/qemu-system-x86_64  -enable-kvm -name win7 -M pc-0.15 -m 1024 
-boot c -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -monitor 
stdio -drive file=/home/fedora.img,if=none,format=raw,cache=none,id=drive0 
-chardev spicevmc,id=charchannel2,name=vdagent -device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel2,id=channel2,name=com.redhat.spice.0
 -chardev pty,id=charchannel3 -device 
virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel3,id=channel3,name=arbitrary.virtio.serial.port.name
 -usb -device usb-tablet,id=input0 -spice port=3007,addr=****,disable-ticketing 
-vga qxl -global qxl.vram_size=67108864 -device 
AC97,id=sound0,bus=pci.0,addr=0x4 -device 
virtio-blk-pci,drive=drive0,bus=pci.0,addr=0x6,bootindex=1 -drive 
id=drive1,if=none,cache=none,format=raw,file=/home/data.img -device 
virtio-blk-pci,drive=drive1,bus=pci.0,addr=0x7 -drive 
id=drive2,if=none,cache=none,format=raw,file=/home/data2.img,aio=native -device 
virtio-blk-pci,drive=drive2,bus=pci.0,addr=0x8,scsi=off,x-data-plane=on,config-wce=off


2. Testing Tool And Testing Params:
        a). Only IOZone App Running in VM, and no other IO in Host (Dom0)
        b). Testing of two disks separately, not simultaneously
    c). IOZone cmd:  ./iozone -a -n 5g -g 5g -i 0 -i 2 -f /dev/vdc1(/dev/vdb1) 

3. Testing Results:

        a). Writer Report: 

        data_size       KBPS_dataplane  KBPS_non_dataplane
                64K                     127751                  129003
                128K            125585                  108917
                256K            128572                  114106
                512K            118301                  116945
                1024K           122934                  121302
                2048K           126224                  123462
                4096K           127413                  124632
                8192K           129049                  125825
                16384K          131293                  126310

        b). Re-writer Report:

        data_size       KBPS_dataplane  KBPS_non_dataplane
                64K                     128363                  125999
                128K            128326                  125836
                256K            128299                  125769
                512K            127641                  125834
                1024K           128222                  126132
                2048K           127979                  125770
                4096K           128046                  125736
                8192K           128104                  125520
                16384K          128022                  125739

        c). Random Read Report:

        data_size       KBPS_dataplane  KBPS_non_dataplane
                64K                     8988                    8700
                128K            16160                   15805
                256K            27114                   27022
                512K            45212                   45659
                1024K           66262                   68581
                2048K           91530                   91457
                4096K           107785                  107398
                8192K           117001                  116474
                16384K          122036                  121043

        d). Random Write Report:

        data_size       KBPS_dataplane  KBPS_non_dataplane
                64K                     21344                   21309
                128K            27215                   26989
                256K            37587                   37851
                512K            55336                   54930
                1024K           73673                   73146
                2048K           93614                   92415
                4096K           107470                  105759
                8192K           104951                  104102
                16384K          116080                  113490

> -----邮件原件-----
> 发件人: Zhangleiqiang
> 发送时间: 2013年4月1日 21:35
> 收件人: Stefan Hajnoczi; address@hidden
> 抄送: address@hidden; leiqzhang; Haofeng; Luohao (brian);
> Zhangleiqiang
> 主题: [Qemu-devel] question about performance of dataplane
> 
> Hi, Stefan：
> 
>       I have done some testing to compare the performance of dataplane and
> non-dataplane.  But the result did not meet my expectations, the
> performance of disk with dataplane enabled did not have advantage over
> non-dataplane.
> 
>       The following  contains the  environment info and testing results.
> Does my testing method or testing environment have something wrong ?
> Could you give me some advice?  I can provide more information if need.
> 
> 
> 1. Environment:
>       a). Qemu 1.4 master branch
>       b). kernel:  3.5.0-2.fc17.x86_64
>          c). virtual disks location:  the same local SATA harddisk with ext4 
> fs
>       d). VM start cmd (os: win7/qed, disk1: raw/non-dataplane/10G/NTFS,
> disk2: raw/dataplane/10G/NTFS) :
> 
> ./x86_64-softmmu/qemu-system-x86_64  -enable-kvm -name win7 -M pc-0.15
> -m 1024 -boot c -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5
> -monitor stdio -drive
> file=/home/win7.qed,if=none,format=qed,cache=none,id=drive0 -chardev
> spicevmc,id=charchannel2,name=vdagent -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel2,id=channel2,na
> me=com.redhat.spice.0 -chardev pty,id=charchannel3 -device
> virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel3,id=channel3,na
> me=arbitrary.virtio.serial.port.name -usb -device usb-tablet,id=input0 -spice
> port=3007,addr=****,disable-ticketing -vga qxl -global
> qxl.vram_size=67108864 -device AC97,id=sound0,bus=pci.0,addr=0x4 -device
> virtio-blk-pci,drive=drive0,bus=pci.0,addr=0x6,bootindex=1 -drive
> id=drive1,if=none,cache=none,format=raw,file=/home/data.img -device
> virtio-blk-pci,drive=drive1,bus=pci.0,addr=0x7 -drive
> id=drive2,if=none,cache=none,format=raw,file=/home/data2.img,aio=native
> -device
> virtio-blk-pci,drive=drive2,bus=pci.0,addr=0x8,scsi=off,x-data-plane=on,config-
> wce=off
> 
> 
> 2. Testing Tool And Testing Params:
>       a). Only IOMeter App Running in VM, and no other IO in Host (Dom0)
>       b). 100% Random IO, data_size(16K/32K/4K), RW_Ratio(0%/25%/75%
> Read)
>       c). Testing of two disks separately, not simultaneously
> 
> 3. Testing Results:
> 
> datasize/RW_Ratio             IOPS_dataplane  IOPS_non_dataplane
>       MBPS_dataplane  MBPS_non_dataplane
>       16K/0%                  294.094948                      293.609606
>       4.595234                        4.58765
>       16K/25%                 283.096745                      281.649258
>       4.423387                        4.40077
>       16K/75%                 316.039801                      309.585336
>       4.938122                        4.837271
>       32K/0%                  257.529537                      258.806128
>       8.047798                        8.087692
>       32K/25%                 253.729281                      253.756673
>       7.92904                 7.929896
>       32K/75%                 292.384568                      280.991434
>       9.137018                        8.780982
>       4K/0%                   321.599352                      324.116063
>       1.256247                        1.266078
>       4K/25%                  309.906635                      309.294278
>       1.210573                        1.208181
>       4K/75%                  350.168882                      350.772329
>       1.367847                        1.370204
> 
> 
> 
> ----------
> Leiqzhang
> 
> Best Regards
> 
> 
> > 发件人: address@hidden
> [mailto:address@hidden 代表
> leiqzhang
> > 发送时间: 2013年3月28日 12:03
> > 收件人: Stefan Hajnoczi
> > 抄送: address@hidden; address@hidden;
> address@hidden; 张 磊强
> > 主题: [Qemu-devel] 回复： dataplane bug: fail to start Windows VM with
> dataplane enable
> >
> > Hi, Stefan:
> >
> >     Thank for your reply and patch. I have done the test for Windows 7,
> Windows 2003, and fedora.
> >
> >      The patch has fixed the problem now, thanks.
> >
> > --
> > leiqzhang
> > Sent by  Sparrow
> >
> > 在 2013年3月27日星期三，23:41，Stefan Hajnoczi 写道：
> > On Tue, Mar 26, 2013 at 11:10:35PM +0800, 张磊强 wrote:
> > Hi, Paolo && Stefan:
> >
> > When I test the dataplane feature with qemu master, I find that
> > Windows (Windows 7 and Windows 2003) VM will hang if dataplane is
> > enabled. But if I try to start a Fedora VM, it can start normally.
> >
> > The command I boot QEMU is:
> > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive
> > file=win7.img,if=none,id=drive-virtio-disk,format=raw,cache=none,aio=native
> > -device
> virtio-blk-pci,config-wce=off,scsi=off,x-data-plane=on,drive=drive-virtio-disk,id=
> virtio-disk
> >
> > I found the similar bug has reported some days ago:
> > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html
> > . And a patch for this bug has already committed by Paolo at Mar 13:
> > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html
> > .
> >
> > But it cannot work under my environment. Could you give me some advise
> > to debug this problem ? I can provide more information if need.
> >
> > I sent a fix and CCed you on the patch. Please test it if you have
> > time.
> >
> > Stefan
> >