Re: [Xen-users] Suggestions for the xen user's manual / wiki

[Ralph Passgang <ralph@xxxxxxxxxxxxx>]

Am Dienstag, 10. Januar 2006 23:40 schrieb Michael Heyse:
> Hi,
>
> there are two issues wich cost me some time to figure out and maybe it
> made sense if someone put them into the documentation and / or wiki,
> because without these addressed my system ran pretty instable and wasn't
> very usable. This applies to xen-3.0 and kernel 2.6.12.6-xen:
>
>
> 1) Networking issue
>
> With the default bridged setup, networking was quite flaky, e.g. samba
> access from dom0 to a server in domU was impossible, ssh connections
> froze, and dmesg contained lots of lines like "Received packet needs 8
> bytes more headroom". A short explanation is found in
>
> http://lists.xensource.com/archives/html/xen-devel/2005-12/msg00226.html
>
> and is apparently due to some bug in the networking code. The suggested
> workaround fixed this problem for me: set the mtu to 1400 for all
> network interfaces in dom0 and domU.
>
> I'm actually suprised that this is not a FAQ.

I had exactly this problem on one testing box. Changing the mtu should help, 
but better is to use xen-3.0-testing. This bug is fixed in xen-3.0-testing.

why it's not in the faq? probably because the most users won't see this on xen 
3.0.0 release, just on some configuration this seems to happen.

and also this is not a long term issue and that's probably why not worth to be 
mentioned in the faq.

--Ralph

[...]
> Thanks,
> Michael

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