RE: [Xen-devel] poor domU VBD performance.

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

>       reqsze    MB/sec    svcmt
> 
> xenU    16k     6266.67   1.25
>         32k    12618.67   1.20 
>         64k    25002.67   1.28
>        128k    49322.67   1.35
>        256k    58538.67   3.15
> 
> xen0    16k    13818.67   1.15
>         32k    27573.33   1.16
>         64k    54784.00   1.16
>        128k    58581.33   2.18
>        256k    58453.33   4.38
> 
> noXen   16k    58679.19   0.27
>       32k    58453.33   0.54
>       64k    58713.04   1.08
>        128k    58174.09   2.17
>        256k    58820.07   4.36

These figures for xen0 are interesting. It's odd that we tail off so
badly for short requests. What interrupt rates are occuring when you do
these tests?

Thanks,
ian

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