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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: Wed, 7 Feb 2007 22:28:45 -0000
  • Delivery-date: Wed, 07 Feb 2007 14:28:54 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdK+jiqriCsapEURu2xJrczH618IwADAVAA
  • Thread-topic: [Xen-devel] vif interface dropping 80% packets

> Indeed, xen-unstable is MUCH better - TCP_SENDFILE looks more like
> on my first try from native to domU with no fiddling.
> The fact that xen-unstable is based on 2.6.18 is a big help, also.
> Ian, is this more in line with what you have seen before?

That's more like it. If you work with us and do some profiling etc we
can probably help you improve it some more. 

If you want really good network performance in domU's you should write a
driver that gives guests direct access to a virtual interface on the
card in a safe and protected manner. The solarflare guys have got some
excellent results by doing this, and have made their design and patches
available. We're hoping to get something based on their proposed
architecture into mainline Xen, and are looking for interested parties
to help...


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