From: Brian Gerst <bgerst@didntduck.org>
To: lkml <linux-kernel@vger.kernel.org>
Cc: Andi Kleen <ak@suse.de>
Subject: Bogus load average and cpu times on x86_64 SMP kernels
Date: Wed, 05 Oct 2005 03:16:59 -0400 [thread overview]
Message-ID: <43437DEB.4080405@didntduck.org> (raw)
I've been seeing bogus values from /proc/loadavg on an x86-64 SMP kernel
(but not UP).
$ cat /proc/loadavg
-1012098.26 922203.26 -982431.60 1/112 2688
This is in the current git tree. I'm also seeing strange values in
/proc/stat:
cpu 2489 40 920 60530 9398 171 288 1844674407350
cpu0 2509 60 940 60550 9418 191 308 0
The first line is the sum of all cpus (I only have one), so it's picking
up up bad data from the non-present cpus. The last value, stolen time,
is completely bogus since that value is only ever used on s390.
It looks to me like there is some problem with how the per-cpu
structures are being initialized, or are getting corrupted. I have not
been able to test i386 SMP yet to see if the problem is x86_64 specific.
--
Brian Gerst
next reply other threads:[~2005-10-05 7:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-05 7:16 Brian Gerst [this message]
2005-10-05 18:00 ` Bogus load average and cpu times on x86_64 SMP kernels Brian Gerst
2005-10-07 4:15 ` [PATCH] Fix hotplug cpu on x86_64 Brian Gerst
2005-10-07 9:50 ` Andi Kleen
2005-10-08 0:50 ` Anton Blanchard
2005-10-08 10:33 ` Andi Kleen
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