At Thu, 30 Jun 2011 05:31:05 +0800 CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
> On 6/30/11, Giovanni Tirloni <gtirloni@xxxxxxxxxxxx> wrote:
> > Linux includes I/O in how it calculates the load average so you're not
> > measuring CPU alone.
>
> On the host, it's expected, I've got two qemu-kvm process loading up
> 100% cpu. Within the guest VM, top looks like this, high load but low
> cpu %.
>
> top - 10:21:40 up 1 day, 59 min, 0 users, load average: 16.72, 6.05, 2.29
> Tasks: 176 total, 1 running, 175 sleeping, 0 stopped, 0 zombie
> Cpu(s): 3.3%us, 1.2%sy, 1.2%ni, 91.2%id, 2.7%wa, 0.1%hi, 0.2%si, 0.0%st
> Mem: 1017392k total, 970564k used, 46828k free, 1436k buffers
> Swap: 2040244k total, 200572k used, 1839672k free, 30344k cached
>
> > What does top show?
> > Any error messages in /var/log during the time the server is unresponsive?
> > Is network responsive? Latency normal too?
>
> I think the network is responsive, pings work but nothing else does.
> No error messages in both host and guest. faillog, messages and dmesg
> give no clue. Which is why I figured I really need to be logged in,
> check and if necessary kill innocent processes one by one until I find
> the culprit when it's going crazy.
This looks a lot like my server looked/looks when being hit on by the
spambot(s). Lots of I/O, not much CPU. Moving message bytes around,
etc. What does maillog look like? There won't be errors, but how much
message traffic is there?
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