Re: Intel Hyperthreading problem on server?
El mar, 16-12-2003 a las 12:39, Jason Lim escribió:
> 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:
> http://lists.debian.org/debian-apache/2002/debian-apache-200207/msg00005.html
>
Mhm... i dont want to be hasty, but it seems im looking at exactly this
problem for a very memory hungry php application....
> 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
> see
> > 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
> perhaps
> > HyperThreading processors?
> >
> > Thanks in advance.
> >
> > Sincerely,
> > Jas
> >
> >
> > --
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