From: Nico Schottelius <nico-kernel@schottelius.org>
To: linux-kernel@vger.kernel.org
Cc: nico-kernel@schottelius.org
Subject: vmstat: zero cs | system debug
Date: Tue, 23 Nov 2004 14:38:05 +0100 [thread overview]
Message-ID: <20041123133805.GF3775@schottelius.org> (raw)
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Hello!
Some minutes ago I had the following problem:
- a fileserver with many process in 'D' state
- vmstat shows zero context switches
- more or less zero access to the system
- system load of ~150 (many smbd processes with 'D')
- raid looked fine
- no errors in dmesg
- no mysterious processes
- system not hacked (as its in our company lan)
- after rebooting it seems to work
- the initialization of the Adaptec AHA-2940U/UW/D / AIC-7881U took
quite long, but it works
My questions:
- what could I have done to find out the problem?
-> I did ps axu, vmstat, cat /proc/mdstat, free, netstat -an
- does zero context switches mean there is one process using
completly the cpu? if so, why was I able to start vmstat?
- what todo to fix the problem?
-> tried killall -9 smbd apache ...
- is there some TFM for reading about "Linux system analyzing"?
Thanks for any answer,
Nico
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next reply other threads:[~2004-11-23 13:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-23 13:38 Nico Schottelius [this message]
2004-11-25 9:25 ` vmstat: zero cs | system debug Alex Riesen
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