Tomasz Chmielewski schrieb:
The host is running kvm-83.
Affected guests are running 2.6.27.14 kernels and use virtio drivers.
The problem happens only _sometimes_. Out of 9 guests I have running on
this host, I saw this problem only on 3 guests. I never saw this
happening on more than one guest at a time.
All three have 512 MB memory assigned, other guests have less memory.
I upgraded ~2 days ago to kvm-84 and the same just happened for a guest with 256 MB memory.
Note how _time_ is different (similar timings are to other unaffected guests):
# ping -f -c 10000 <unaffected_guest>
10000 packets transmitted, 10000 received, 0% packet loss, time 12313ms
rtt min/avg/max/mdev = 0.432/1.164/96.163/1.934 ms, pipe 7, ipg/ewma 1.231/1.111 ms
# ping -f -c 10000 <affected_guest>
10000 packets transmitted, 10000 received, 0% packet loss, time 135625ms
rtt min/avg/max/mdev = 0.807/14.228/55.569/5.779 ms, pipe 4, ipg/ewma 13.563/8.601 ms
Running "dd if=/dev/vda of=/dev/null" on the affected guest reduces that a bit:
# ping -f -c 10000 <affected_guest>
10000 packets transmitted, 10000 received, 0% packet loss, time 50469ms
rtt min/avg/max/mdev = 0.616/4.881/54.357/3.847 ms, pipe 5, ipg/ewma 5.047/7.783 ms
Anyone? Is it a known bug?
--
Tomasz Chmielewski
http://wpkg.org
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