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xen-api
[Xen-API] Re: [Xen-devel] io performance regression between xen and XCP
On Mon, 2010-05-31 at 13:58 -0400, Xiao Guangrong wrote:
> Hi guys,
>
> We have done the io performance test between xen and XCP, both tested on a
> separate disk, and found XCP's regression is very great:
>
> XCP's parameters:
> Ｄom0
> ====== Control[d44ecc85-5539-438d-9bbc-f596dec69617] info:
> VCPU:
> VCPUs-params (MRW): mask: 0,1
> VCPUs-max ( RW): 8
> VCPUs-at-startup ( RW): 8
> VCPUs-number ( RO): 8
> VCPUs-utilisation (MRO):
> Mem:
> memory-actual ( RO): 2146172928
> memory-target ( RO): 2146172928
> memory-overhead ( RO): 1048576
> memory-static-max ( RW): 2146172928
> memory-dynamic-max ( RW): 2146172928
> memory-dynamic-min ( RW): 1887436800
> memory-static-min ( RW): 307232768
>
> Guest:
> ====== spv1[9a1a2bf2-41a7-ca00-8dc5-92c51b6ed992] info:
> VCPU:
> VCPUs-params (MRW): mask: 7
> VCPUs-max ( RW): 1
> VCPUs-at-startup ( RW): 1
> VCPUs-number ( RO): 1
> VCPUs-utilisation (MRO): 0: 0.000
> Mem:
> memory-actual ( RO): 1073741824
> memory-target ( RO): 1073741824
> memory-overhead ( RO): 1048576
> memory-static-max ( RW): 1073741824
> memory-dynamic-max ( RW): 1073741824
> memory-dynamic-min ( RW): 1073741824
> memory-static-min ( RW): 1073741824
>
>
> Xen's parameters:
>
> ###### xm list ######
> Name ID Mem VCPUs State
> Time(s)
> Domain-0 0 2048 2 r----- 52.5
> co5.4-32-2 1 1024 1 -b----
> 33.0
> ###### xm vcpu-list ######
> Name ID VCPU CPU State Time(s) CPU
> Affinity
> Domain-0 0 0 0 r-- 42.2 0
> Domain-0 0 1 1 -b- 10.4 1
> co5.4-32-2 1 0 6 -b- 33.0 6
> ###### xm sched-credit ######
> Name ID Weight Cap
> Domain-0 0 256 0
> co5.4-32-2 1 256 0
>
>
> Test result:
>
> - direct read/write test:
> test command:
> dd if=/dev/zero of=1.img oflag=direct bs=256k count=4096
> dd if=1.img of=/dev/null iflag=direct bs=256k count=4096
>
> Xen: write: 33.3 MB/s read: 206 MB/s
> XCP: write: 18.5 MB/s read: 108 MB/s
>
> - no direct read/write test:
> test command:
> dd if=/dev/zero of=1.img bs=256k count=4096
> dd if=1.img of=/dev/null bs=256k count=4096
>
> Xen: write: 319 MB/s read: 85.9 MB/s
> XCP: write: 136 MB/s read: 63.8 MB/s
>
> Now, we are very confused about this result :-(
These are bare FS writes, not guest throughput?
On ext3 with the 2.6.27 kernel?
Try turning off the barrier flag on the root fs.
Daniel
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