[Xen-devel] horrible nfs server performance on domU

[Tupshin Harper <tupshin@xxxxxxxxxxx>]

I have the following setup:
* amd64 machine with 1.5GB ram and 10 ide drives combined into a few 
software raid five arrays
* 2 lvm volume groups managed by the dom0. One for the domU volumes and 
another for the domU swap partitions
* 1 lvm volume group managed by a domU that acts as a fileserver (nfs, 
samba) to other domUs as well as devices onthe local lan
the "fileserver" domU has 256Mb allocated with 512MB of swap. I'm gettin 
horrendous nfs performance (samba not really tested yet), and the 
fileserver domU frequently is pegged at 99+% system cpu all being use by 
pdflush. The swap is active but is not being used.
I'm running xen-unstable as of a couple weeks ago, and using 
linux-2.6.10-xen + ac patches to get some needed driver support (all 
disks have dma enabled).
right now, i'm looking at top on the fileserver, and even though there 
is virtually no nfs or other network activity, and hasn't been for 10 
minutes, pdflush is still maxing the cpu.
Any suggestions?

-Tupshin



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