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RE: [Xen-devel] vif interface dropping 80% packets

  • To: "Reese Faucette" <reese@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
  • Date: Tue, 6 Feb 2007 23:06:40 -0000
  • Delivery-date: Tue, 06 Feb 2007 15:06:53 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdKQcafac7MFnIvR7udNR+Gy4y2LwAARfYw
  • Thread-topic: [Xen-devel] vif interface dropping 80% packets

> update:
> MTU=9000 does work, I had failed to set one of the vif interfaces -
> of interfaces to change ;-)
> The performance is better with 9k MTU, as expected:
> TCP_STREAM and TCP_SENDFILE both get ~1.8Gb/s, xentop reports 87%
> utilization for dom0, so I guess that's about all I can expect without
> changes.

I've seen rather better figures than this with another 10G card.

Does your NIC/driver support TSO and LRO?

> before I spend a lot of time converting to 3.0.4, a couple of
> 1) any reason to expect better perf on 3.0.4 ?

Yes, there were changes in the RX path.

> 2) if yes, Will the patch "fedora-36252.patch" work on the 2.6.16
> included with 3.0.4, or have conflicts crept in?

No idea. What does the patch do?


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