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

Reese Faucette
Tue, 06 Feb 2007 23:35:30 -0000

>> update:
>> 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
>> code changes.
>
> I''ve seen rather better figures than this with another 10G card.
> Does your NIC/driver support TSO and LRO?

yes to both, and have tried with LRO both enabled and disabled.  again, the
dom0 performance is fine, it''s just to domU that is slower.  I have
network
bridging set up on this interface, i.e. peth2, eth2, xenbr2, etc. - is that
not the way I should be doing it?

>> 2) if yes, Will the patch "fedora-36252.patch" work on the
2.6.16
>> kernel included with 3.0.4, or have conflicts crept in?
>
> No idea. What does the patch do?

This was the mythical patch to make 2.6.18 into a Xen-aware kernel.  Took me
forever to track it down - is there a more obvious place to look?  Sorry to
just refer to the file by name, after googling forever i decided i was the
only person in the Xen world not intimately familiar with this patch.
-reese