Hi,
I would try to check following:
- is dom0 able to take the load?
I found bridging in dom0 with about 30 domU''s an intensive task
which can easily utilize 2 CPU cores. CPU pinning may help.
- is dom0 min-mem high enough to not run out of memory?
- are you able to xm console to a frozen domU?
Just evaluate if only the networking is frozen or if the domUs
are generally unreachable. What shows xentop ?
- if this is a networking issue, are you using tcp offload?
Maybe, you might try to ethtool -K INTERFACE tx off in every
bridge connected domU. Setting dom0 also wont harm.
- is the machine able to take the disk i/o ?
AFAIK hard to measure, but xentop and vmstat should help investigating
into this.
Cheers,
Stephan
Stefan Kögl schrieb:> Hi,
>
> I''m using Xen on an up-to-date RedHat server with CentOS in the
DomUs.
> Randomly and not reproducible, the DomUs are freezing, causing SSH
> connections to be aborted. Also, the DomUs don''t react to pings
during
> this times. Locally, I can''t find any evidence of this problems.
The
> log files don''t contain suspicious entries during this times. The
> whole problem lasts one, maybe two minutes, and then everything is
> back to normal.
>
> The host server is also reachable during this period, so network
> problems are not part of the problem.
>
> Can anyone point me on where to search for the source of the problem?
>
> tia,
>
> Stefan
>
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