At Thu, 30 Jun 2011 05:31:05 +0800 CentOS mailing list centos@centos.org wrote:
On 6/30/11, Giovanni Tirloni gtirloni@sysdroid.com 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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