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xen-devel
Re: [Xen-devel] qemu VS tapdisk2 VS blkback benchmarks
On Fri, 2010-12-10 at 11:45 -0500, Stefano Stabellini wrote:
> Hi all,
> as promised I run some simple benchmarks using tapdisk2 and the new qemu
> as disk backends.
> If you are in a hurry skip to the last section to see the test results.
Interesting. I'll look into it when the userspace stuff is working.
Thanks!
Daniel
>
> SOFTWARE REQUIREMENTS
> ---------------------
> In order to reproduce these results you need to use the new qemu with
> linux aio and O_DIRECT as disk backend:
>
> - apply the libxl patches that Anthony sent to the list a little while ago;
>
> - compile qemu with linux aio support, you might need few hacks to work
> around limitations of the glic/libaio installed in your system;
>
> - add BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO to the flags used by qemu to open
> the disks;
>
> - some gntdev fixes to allow aio and O_DIRECT on granted pages, not yet
> sent to the list (but soon).
>
>
>
>
> TEST HARDWARE
> -------------
> I am using a not so new testbox with a 64bit 2.6.37 dom0 with 752MB of ram.
> The guest is a 64 bit PV Lenny guest with a 2.6.37 upstream kernel and 512MB
> of ram.
> Other info about the host follows:
>
> kontiki:~# cat /proc/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 15
> model : 6
> model name : Genuine Intel(R) CPU 3.00GHz
> stepping : 2
> cpu MHz : 3000.014
> cache size : 2048 KB
> fpu : yes
> fpu_exception : yes
> cpuid level : 6
> wp : yes
> flags : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat
> clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc pni est cid
> cx16 hypervisor lahf_lm arat
> bogomips : 6000.02
> clflush size : 64
> cache_alignment : 128
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>
> processor : 1
> vendor_id : GenuineIntel
> cpu family : 15
> model : 6
> model name : Genuine Intel(R) CPU 3.00GHz
> stepping : 2
> cpu MHz : 3000.014
> cache size : 2048 KB
> fpu : yes
> fpu_exception : yes
> cpuid level : 6
> wp : yes
> flags : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat
> clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc pni est cid
> cx16 hypervisor lahf_lm arat
> bogomips : 6000.02
> clflush size : 64
> cache_alignment : 128
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>
>
> kontiki:~# smartctl -a /dev/sda
> Model Family: Hitachi Deskstar T7K250 series
> Device Model: HDT722516DLA380
> Serial Number: VDN71BTCDDVR6G
> Firmware Version: V43OA91A
> User Capacity: 164,696,555,520 bytes
> Device is: In smartctl database [for details use: -P show]
> ATA Version is: 7
> ATA Standard is: ATA/ATAPI-7 T13 1532D revision 1
> Local Time is: Fri Dec 10 16:07:57 2010 GMT
> SMART support is: Available - device has SMART capability.
> SMART support is: Enabled
>
>
>
>
>
>
> TEST RESULTS
> ------------
> The test is simple: write 1GB of data to disk and measure bandwidth
> and cpu usage.
>
> - tapdisk2 on raw file
> bandwidth: 32MB/s
> average cpu usage: 22%
>
> - qemu on raw file
> bandwidth: 33MB/s
> average cpu usage: 12%
>
> - blkback on LVM
> bandwidth: 39MB/s
>
> - qemu on LVM
> bandwidth: 38MB/s
>
>
>
>
> CONCLUSIONS
> -----------
> Qemu beats tapdisk2 on raw files (the bandwidth is the same but the cpu
> usage is lower).
> Qemu has similar performances to blkback on LVM from the bandwidth
> perspective, but I didn't measure the cpu usage in that case.
>
>
> Cheers,
>
> Stefano
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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