RE: [Xen-devel] 2.4.29-xenU VBD performance (problem)

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Both the dom0 and domU were using 128 MB of RAM. I tested with:
> "dd if=/dev/zero of=/dev/foo bs=1024k count=2048". That makes 
> 2 GB of data to
> write, so that will definitely not fit in the RAM / buffers. I ran the
> "test" three times on each kernel to be sure about the result.
> The CPU in the test-box was 3 GHz P4 with 1 MB of l2-cache. 
> The box (both
> the dom0 and domU) were idle besides running the test.

Have you tried enabling hyperthreading and running the dom0 and domU's on 
different threads?

We haven't done any testing with software raid 5 systems. It's possible the 
extra CPU burnt by dom0 is causing bad scheduling interactions.

Ian 


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