[Xen-users] A problem with the xen performance when the block device count is more than 8

[hebzhw <junv.zhang@xxxxxxxxx>]

I have a problem with the xen performance when the block device count is more
than 8, anyone can help me?

The system is centos5.5xen, and the DomU is also a centos5.5, and there are
about 70 block devices. The xen version is 3.0.
When I test in domain-0, the I/O throughput performance is scale with the
block device count. But when I test in DomU, the performance is not scale
when the block device count is more than 8.

Device count        Dom0 perf(MB/s)   DomU perf(MB/s)
1                       384     236
2                       607     312.8
4                       925.6   874
8                       1205.5  1253
16                      1579.3  677.8
24                      1969    493.8
32                      1893.3  501.9
40                      1873.7  535.9
48                      1782    556.7
56                      1553.4  565.3
64                      1753.4  571.5

Can anyone help me? Thanks a lot!

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