[Fedora-xen] are dropped packets a sign of network problem?

[Daniel P. Berrange]

On Fri, Oct 12, 2007 at 10:35:25AM -0700, Gabriel M. Schuyler wrote:
> We've had some network problems that were resolved by disabling tcp  
> checksum offloading on all the domUs.  Our symptom was we couldn't  
> ssh (or do much else) between two domUs on the same physical host.

That should be neccessary at all - there were some bugs in this respect
a long time ago, but it works fine now, assuming you keep your kernels
up2date with errata. Turning off checksum offload will destroy network
performance/throughput for your guests - particularly guest<->guest
networking, but also guest -> network. 

Dan.
-- 
|=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
|=-           Perl modules: http://search.cpan.org/~danberr/              -=|
|=-               Projects: http://freshmeat.net/~danielpb/               -=|
|=-  GnuPG: 7D3B9505   F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505  -=|