Re: Intel Hyperthreading problem on server?
Hi,
I just checked the kernel info for the memory support part:
│ If you are compiling a kernel which will never run on a machine with
│
│ more than 960 megabytes of total physical RAM, answer "off" here
(defau │
│ choice and suitable for most users). This will result in a "3GB/1GB"
│
│ split: 3GB are mapped so that each process sees a 3GB virtual memory
│
│ space and the remaining part of the 4GB virtual memory space is used
│
│ by the kernel to permanently map as much physical memory as
│
│ possible.
│
│
│
│ If the machine has between 1 and 4 Gigabytes physical RAM, then
│
│ answer "4GB" here.
│
│
I guess with 1.5Gb RAM you need to go with the 4Gb option... so that won't
work :-( and having just 960M RAM wouldn't work either...
>
>
> > 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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> > > > with a subject of "unsubscribe". Trouble? Contact
> > listmaster@lists.debian.org
> > > >
> > >
> > > --
> > > ------------------------------------------
> > > Ted Knab
> > > Chester, MD 21619
> > > ------------------------------------------
> > > 35570707f6274702478656021626f6c6964796f6e602f66602478656
> > > 02e6164796f6e60237471647560216e6460276c6f62616c60257e696
> > > 4797e2a0
> > >
> > >
> > > --
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> > >
> > >
> >
> >
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> >
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