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

[Andrew Theurer <habanero@xxxxxxxxxx>]

On Thursday 31 March 2005 15:32, Ian Pratt wrote:
>  > Could you try again, but replace calls to
> >
> > blk_run_queue(plugged_queue) in blkback.c with:
> >     if ( plugged_queue->unplug_fn )
> >            plugged_queue->unplug_fn(plugged_queue);
> >
> > This looks like a better match with what various other
> > drivers do (e.g.
> > swraid).

OK, changes worked for me, but still have some min latency here (but 
much better)

      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




        






_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel