Re: Intel Hyperthreading problem on server?
Well, its not that the kernel does not detect the ht, it does and quite
fine (shows lots of processors in the box and all).
The problem is that apache is crashing under high load with a segfault.
Now, as i understand it, this can be a faulty hardware problem (bad
memory=segfault) or an actual software problem.
Im not shure, but im having this problem as well with an HT server and
have not been able to rule out the possibility of a faulty hardware
thing. Nonetheless, this can also be, for example, an ugly module in
woodies php4 which are particluarly edgy (xslt for example) under high
load due to them being in beta stage by the time woody froze.
El mar, 16-12-2003 a las 20:07, Theodore Knab escribió:
> 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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> > with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
> >
>
> --
> ------------------------------------------
> Ted Knab
> Chester, MD 21619
> ------------------------------------------
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> 02e6164796f6e60237471647560216e6460276c6f62616c60257e696
> 4797e2a0
>
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