Re: Scheduling problems
From: Rob Weir (rweir_at_ertius.org)
Date: Tue, 11 May 2004 20:11:35 +1000 To: firstname.lastname@example.org
On Fri, May 07, 2004 at 02:22:50PM +0100, Chris Boot said
> I'm having several problems concerning scheduling on my linux box. I'm
> running it as a server and therefore I'd like it to be as reliable as
> possible, but several niggling factors force me to reboot the box
> relatively often.
> The biggest problem I have is if there is no CPU idle time (as reported
> by top(1)) processes take a very long time to start up, and sometimes
> even fail to start entirely. I can trigger this very easily and it is
> very reproducible. I tried to run the Distributed.net client at some
> point but it ground my system to a halt (even nice'd to 19). This
> prevents me from logging in using SSH to kill the offending process, or
> checking my email, or any other task that requires starting processes.
You say below that you have 1GB of RAM, are you using highmem? This is
all I can think of, and would be a kernel bug...do you see anything
related on http://bugzilla.kernel.org/?
> The next biggest problem is related to the above, I think. When I
> connect to my box using SSH, and the connection is broken somehow, the
> SSHd process takes up all the available CPU after just a couple of
> seconds. All I need to do to trigger this is to connect to the server,
> then kill the SSH client process. After a few seconds, the server
> process reaches 99.9% CPU usage:
> [bootc@arcadia bootc]$ pa | grep notty
> bootc 24408 99.9 0.4 10688 3928 ? R 14:15 0:38 sshd:
> bootc 24448 0.0 0.0 1576 496 pts/7 S+ 14:16 0:00 grep
No idea about this, I can't imagine why SSH would suddenly take so much
CPU time. Is there anything in the ssh Debian bug list about this?
-- Rob Weir <email@example.com> | firstname.lastname@example.org | Do I look like I want a CC? Words of the day: Ron Brown Lon Horiuchi enigma nitrate argus Freeh government
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