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xen-users
Re: [Xen-users] unstable network problem
Ernst Bachmann wrote:
On Monday 08 August 2005 15:34, Tim Durack wrote:
I must be doing something wrong:
Have set up a basic Xen system, Dom0 + one Xen0 guest. Configured for
a routed network.
Ping Dom0 -> guest works.
Ping guest -> Dom0 works.
nmap Dom0 -> guest reports port 22 open.
Ssh Dom0 -> guest hangs.
ssh guest -> Dom0 hangs. Same behaviour. Watching a packet capture
shows traffic passing but with retransmits and poor performance.
If I build a gre tunnel between Dom0 and guest, everything works fine,
with the exception that I must generate some traffic from the guest
first.
I have no iptables rules configured, so it's not that. Looks like
there is maybe some issue with tcp traffic between domains.
Looks like a bug to me, but I'm posting to the user list first.
There was a long thread about this problem maybe one or two weeks ago...
I think the problem was that the virtual eth devices had packet queueing
disabled (txqueuelen:0 on ifconfig), and had a 4k size max. ring buffer for
transfering packets between domains.
Whenever that buffer would run full, packets are dropped...
A too-small network buffer should never be able to hang a system; then
again, it's unclear what Tim means by 'hang'.
--
Kind regards,
Mogens Valentin
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