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xen-devel
RE: [Xen-devel] Direct I/O to domU seeing a 30% performance hit
> There have been a couple of network receive throughput
> performance regressions to domUs over time that were
> subsequently fixed. I think one may have crept in to 3.0.3.
The report was (I believe) with a NIC directly assigned to the domU, so
not using netfront/back at all.
John: please can you give more details on your config.
Ian
> Are you seeing any dropped packets on the vif associated with
> your domU in your dom0? If so, propagating changeset
> 11861 from unstable may help:
>
> changeset: 11861:637eace6d5c6
> user: kfraser@xxxxxxxxxxxxxxxxxxxxx
> date: Mon Oct 23 11:20:37 2006 +0100
> summary: [NET] back: Fix packet queuing so that packets
> are drained if the
>
>
> In the past, we also had receive throughput issues to domUs
> that were due to socket buffer size logic but those were
> fixed a while ago.
>
> Can you send netstat -i output from dom0?
>
> Emmanuel.
>
>
> On Mon, Nov 06, 2006 at 09:55:17PM -0800, John Byrne wrote:
> >
> > I was asked to test direct I/O to a PV domU. Since, I had a system
> > with two NICs, I gave one to a domU and one dom0. (Each is
> running the
> > same
> > kernel: xen 3.0.3 x86_64.)
> >
> > I'm running netperf from an outside system to the domU and
> dom0 and I
> > am seeing 30% less throughput for the domU vs dom0.
> >
> > Is this to be expected? If so, why? If not, does anyone
> have a guess
> > as to what I might be doing wrong or what the issue might be?
> >
> > Thanks,
> >
> > John Byrne
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
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