Re: Intel Hyperthreading problem on server?
Hi,
Interesting info... especially the part:
> Do you have high memory support compiled in ?
> High memory support above 4GB might cause problems.
>
> If you do not have more than 2GB of RAM you should make sure that High
> memory support is not enabled.
The server has 1.5Gb RAM. I compiled it to have High Memory support (4Gb)
because I don't know how much more RAM it may have added in the future. I
suppose I could try going back as you suggested, but the Kernel info
suggests that the 4Gb RAM High memory support *should* work for RAM less
than that too :-/
Most frustrating. I will try re-compiling with your suggestion a bit later
today, and let you know how it turns out.
----- Original Message -----
From: "Theodore Knab" <tjk@annapolislinux.org>
To: <debian-isp@lists.debian.org>
Sent: Wednesday, December 17, 2003 10:07 AM
Subject: Re: Intel Hyperthreading problem on server?
> I am using the 2.4.20 kernel with SMP support on a Hyper-threading
> Intel. I remember having problems getting it work with SMP support
> initially.
>
> I think the kernel has to be perfect. ;-)
>
> Do you have high memory support compiled in ?
> High memory support above 4GB might cause problems.
>
> If you do not have more than 2GB of RAM you should make sure that High
> memory support is not enabled.
>
> Also did you enable hyper-threading in BIOS ?
> Auto-detect modes might cause problems.
>
http://publib-b.boulder.ibm.com/Redbooks.nsf/RedbookAbstracts/tips0175.html?Open
>
> My system:
>
> Linux tedsdesk 2.4.20 #22 SMP Mon Jul 21 14:53:07 EDT 2003 i686
> GNU/Linux
>
> ted@tedsdesk:cat /proc/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 15
> model : 1
> model name : Intel(R) Pentium(R) 4 CPU 1.50GHz
> stepping : 2
> cpu MHz : 1495.172
> cache size : 256 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 2
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
> bogomips : 2981.88
>
> The ht in the flags section tells me hyper threading is being
recognized.
>
> On 16/12/03 23:23 +0800, Jason Lim wrote:
> > Hi All...
> >
> > Do you guys know anything about a problem with Intel Hyper-threading
(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
> > Hyper-Threading processors?
> >
> > Thanks in advance.
> >
> > Sincerely,
> > Jas
> >
> >
> > --
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listmaster@lists.debian.org
> >
>
> --
> ------------------------------------------
> Ted Knab
> Chester, MD 21619
> ------------------------------------------
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>
>
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