[CentOS-virt] Xen network problem
kbass at kenbass.com
Fri Oct 30 20:26:35 UTC 2009
I have a machine with 8 CPU's (2 quad xeons). (Centos 5.4 currently).
Currently, I am running 2 domUs. One with 4 CPUs and another with 2. 2
remain unused. I am using routed networking.
On the one machine with 4 CPU's, there is a cronjob at 4am which
utilizes the CPU/disk pretty heavily. It is rebuilds a mailing list
archive (using MHonarc) and rebuilds a search engine index (swish-e). I
dont think it uses more than 1 CPU though because the index rebuilding
is not multi threaded, as far as I know.
This cron runs at 4am each day and takes about 7 minutes. My ISP is
telling me that their alarms are going off because they cannot ping my
server between 4am and 4:07am.
It sounds like the domU is impacting the overall Xen performance. Is
there anything I can do to tune this? It kinda defeats the whole Xen
virtualization concept if a single CPU messes up the network. I am going
to try to add a 'nice' to the crontab for the 4am job, but still,
something doesn't seem correct. Any suggestions would be much
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