I'll just note here, that HT really pushes the proc, it might just be
flaky hardware - especially if it's overclocked. I can run my computer
for ours on end without problems overclocked 20% and everything is fine -
but fire up two mersenne prime threads and it starts giving bad
answers (a single one is ok and two work ok when overclocked to 15%). So
even though for me the problem occurs at full throttle with 20%
overclocking, your hardware might be worse and it might occur at full
throttle (the kind which only the extra performance boost from HT can
bring out) even without it being overclocked.
Of course this is only 1 possibility... Maybe HT support on 2.4 is just
plain buggy... don't know, never used HT on 2.4.
On Thu, 3 Mar 2005, Benjamin J. Weiss wrote:
> Charles Lee wrote:
>
> >>From: "Benjamin J. Weiss" <benjamin@xxxxxxxxxxx>
> >>Subject: Re: [Centos] Installing CentOS-4 in VMWare Workstation 4.5.2
> >>
> >>
> >
> >
> >
> >>I hate to say this, but so far WinXP handles the
> >>HyperThreading of my P4
> >>better than I've found linux smp kernels to do. I haven't had
> >>the chance
> >>to try the 2.6 kernel in CentOS yet, but there it is.
> >>
> >>
> >
> >So what exactly does "handles the HyperThreading of my P4 better than I've
> >found linux smp kernels to do" mean?
> >
> >The gains brought by HyperThreading for most workloads are so marginal that
> >I'd suggest switching off in the BIOS if you're using a 2.4 based kernel.
> >
> >
> Well, when I had a process that ate a bunch of CPU on my P4 under the
> 2.4 kernel in HT mode, sometimes I'd get a kernel panic or other crash
> in RHEL 3. For instance, if I was trying to run VMWare in smp mode
> (running a Windows guest system on the RHEL 3 host system), sometimes
> the vm would crash, twice the whole system died. If I ran the VMWare in
> uni-processor kernel, it would run fine though it would eat resources.
>
> I haven't had that happen in XP yet, when running the RHEL/CentOS guest
> operating systems on the XP host OS. I haven't had time to try it on
> CentOS 4 as the host OS yet to see how the 2.6 kernel handles the load.
>
> Ben
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