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Re: Intel Hyperthreading problem on server?

Just noticed one more thing... it appears to be Apache causing the super
high load (among other programs running) when SMP is compiled into the
kernel, and with a bunch of errors in syslog:

[Wed Dec 17 02:27:37 2003] [notice] child pid xxxxxx exit signal
Segmentation fault (11)

(and a whole bunch of these errors, like 50 lines)

I did a search and someone said it has to do with Apache requesting memory
that it doesn't own or something:

but that doesn't really help in this case, unless you guys can think of a
different angle on this?

----- Original Message ----- 
From: "Jason Lim" <maillist@jasonlim.com>
To: <debian-isp@lists.debian.org>
Sent: Tuesday, December 16, 2003 11:23 PM
Subject: Intel Hyperthreading problem on server?

> Hi All...
> Do you guys know anything about a problem with Intel Hyperthreading (eg.
> on the Intel 2.4Ghz HT-enabled processor) that would cause the load
> average to jump to over 200?
> Here is the log line:
> Dec 16 22:48:17 be watchdog[250]: loadavg 203 101 40 is higher than the
> given threshold 200 150 100!
> (then it reboots)
> This happened on the 2.4.22 kernel, and now I tried it with the 2.4.23
> kernel, and it has the same problem.
> When the kernel is compiled WITHOUT SMP support, the kernel works fine,
> and it can have uptimes of months without any problem. But when SMP is
> compiled in, and the HT processor is correctly identified (and top can
> CPU0 and CPU1), then it only takes about an hour or two of operation
> before the load average jumps like that. Note that this is with Debian
> woody/stable, and with a clean kernel.org kernel.
> Do you guys know anything about this, or have any ideas where I should
> look? Is there something in Woody that isn't friendly with SMP or
> HyperThreading processors?
> Thanks in advance.
> Sincerely,
> Jas
> -- 
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