[Xen-users] XM sched-credit

[Paul Piscuc <paul.piscuc@xxxxxxxxxx>]

Hi,

I have modified the sched-credit for one virtual machine, using xm 
sched-credit -d 0 -w 60000, and the next day Nagios reported some 
problems on Dom0. Two plugins, that are checking the firewall and 
smartctl reported "socket timeout after 10 seconds". When I issued the 
two scripts, one of them took 5 seconds to run, and the other one a few 
minutes. Here is the first command that took 5 seconds:
/sbin/iptables-save|grep -v '^\*' |grep -v '^#' |grep -v '^COMMIT'|grep 
-v '^:'|wc -l
When straced, it pauses for a long time in wait4(). When issued several 
times, it waits a long time on the third or forth grep. The second one 
does the same in read(). The load on the dom0 is 0.02, ulimit is ok,and 
there is no waiting time for the cpu. Also, the virtual machines are 
running smoothly, without high IO, memory or CPU.
Could the problem be generated by the scheduler, that allocated a small 
weight for the dom0?
Thx in advance,

Paul PISCUC

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