On 07/11/2012 04:45 AM, Kir Kolyshkin wrote:
I barely remember there was a fix in the kernel related to this. I
might be wrong, but it's worth checking on a latest rhel6 stable or
testing kernel.
Indeed, I did a search on wiki.opevnz.org for vmstat and found this:
http://wiki.openvz.org/Download/kernel/rhel6/042stab057.1
[fairsched] vmstat floating point operation fixed: idle scaling has been
enhanced once again (PCLIN-30773)
I guess that's what you are reporting. Please update your kernel.
11.07.2012 3:54 пользователь "Mark Johanson" <[email protected]
<mailto:[email protected]>> написал:
Linux solusvm.a2hosting.com <http://solusvm.a2hosting.com>
2.6.32-042stab053.5 #1 SMP Tue Mar 27
vzctl version 3.3
vswap is enabled
Since upgrading to a 2.6.32 kernel one of our users noticed that they
are occasionally getting a Floating Point Exception when running
vmstat:
[root@server ~]# vmstat 1 5
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us sy
id wa st
0 0 0 2048244 0 32816 0 0 0 2 0 7627
0 0
99 0 0
0 0 0 2048236 0 32816 0 0 0 0 0 110
0 0
100 0 0
0 0 0 2048236 0 32816 0 0 0 0 0 78
0 0
100 0 0
0 0 0 2048236 0 32816 0 0 0 0 0 91
0 0
100 0 0
Floating point exception
It doesn't happen every time as you can see here:
[root@server ~]# vmstat 1 10
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us sy
id wa st
0 0 0 2068584 0 12472 0 0 0 0 0 1745
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 82
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 77
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 109
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 92
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 80
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 87
0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 66
0 0
100 0 0
0 0 0 2068588 0 12472 0 0 0 0 0 130
0 0
100 0 0
0 0 0 2068588 0 12472 0 0 0 0 0 72
0 0
100 0 0
I have been able to replicate this issue in other OS templates (theirs
is Ubuntu 11.10, but I have replicated in Ubuntu, Fedora, Centos,
etc...) running the same kernel and vzctl version.
I can not replicate this issue on the node.
Wondering if anyone else has run across this issue and/or knows what
might be causing it.
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