Xiao Guangrong
2010-May-31 17:58 UTC
[Xen-devel] io performance regression between xen and XCP
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 :-(
Xiao
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Daniel Stodden
2010-May-31 20:05 UTC
[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 _______________________________________________ xen-api mailing list xen-api@lists.xensource.com http://lists.xensource.com/mailman/listinfo/xen-api