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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--
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Ted Knab
Chester, MD 21619
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