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* Re: Every semaphore call results in "uninterruptable sleep"
@ 2002-11-15 18:03 Manfred Spraul
  2002-11-16 13:26 ` Xeon with HyperThreading and linux-2.4.20-rc2 Steffen Persvold
  0 siblings, 1 reply; 12+ messages in thread
From: Manfred Spraul @ 2002-11-15 18:03 UTC (permalink / raw)
  To: Kammerloher, Josef, linux-kernel

>
>
>Every semaphore function (semget(),..) ,  "ipcs -s" ... results in
>"uninterruptable sleep".
>The processes cannot be killed by kill -9.
>  
>
Enable sysrequest, then press Alt+SysRQ+T.
It will dump the kernel stack of all processes.
Run in through ksymoops and send the results to the list.

--
    Manfred


^ permalink raw reply	[flat|nested] 12+ messages in thread
* RE: [BUG?] Xeon with HyperThreading and linux-2.4.20-rc2
@ 2002-11-20 15:50 Nakajima, Jun
  2002-11-20 16:00 ` Steffen Persvold
  0 siblings, 1 reply; 12+ messages in thread
From: Nakajima, Jun @ 2002-11-20 15:50 UTC (permalink / raw)
  To: Arjan van de Ven, Hugh Dickins
  Cc: Steffen Persvold, Nakajima, Jun, linux-kernel

As Hugh pointed out, the MPS table should report the physical processors
only even if HT is enabled. The major reason is to support legacy OSes that
don't support HT well. If the BIOS has an option for you to enable/disable
HT, then please use it. 

Jun

> -----Original Message-----
> From: Arjan van de Ven [mailto:arjanv@redhat.com]
> Sent: Wednesday, November 20, 2002 5:04 AM
> To: Hugh Dickins
> Cc: Steffen Persvold; Jun Nakajima; Arjan van de Ven; linux-
> kernel@vger.kernel.org
> Subject: Re: [BUG?] Xeon with HyperThreading and linux-2.4.20-rc2
> 
> On Wed, Nov 20, 2002 at 12:53:04PM +0000, Hugh Dickins wrote:
> >
> > I know too little to comment definitively, but it's my understanding
> > that a dual HT machine should only show 2 processors in its MP table,
> > their siblings only appearing through analysis of the ACPI tables.
> >
> > Whether it's that your MP table has been wrongly set up, or that
> > you've really been given 4 processors when you only asked for 2
> > (sue your supplier!), I cannot say.  I've copied Jun at Intel
> > and Arjan at RedHat, and hope they can shed more light on this.
> 
> Linux has zero problem with a sane MP table that lists all
> CPU's. Intel normally seems to recommend against it (maybe N3.51 doesn't
> like it or so) but it's all fair as far as I'm concerned.
> The bios is supposed to offer you a choice
> to disable hyperthreading, use that ;)
> 
> Greetings,
>    Arjan van de Ven
> 
> 
> --
> But when you distribute the same sections as part of a whole which is a
> work
> based on the Program, the distribution of the whole must be on the terms
> of
> this License, whose permissions for other licensees extend to the entire
> whole,
> and thus to each and every part regardless of who wrote it. [sect.2 GPL]

^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2002-11-20 16:19 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2002-11-15 18:03 Every semaphore call results in "uninterruptable sleep" Manfred Spraul
2002-11-16 13:26 ` Xeon with HyperThreading and linux-2.4.20-rc2 Steffen Persvold
2002-11-19 21:09   ` [BUG?] " Steffen Persvold
2002-11-19 21:42     ` Hugh Dickins
2002-11-20  9:56       ` Steffen Persvold
2002-11-20 12:53         ` Hugh Dickins
2002-11-20 13:04           ` Arjan van de Ven
2002-11-20 13:27             ` Steffen Persvold
2002-11-20 13:26               ` Arjan van de Ven
  -- strict thread matches above, loose matches on Subject: below --
2002-11-20 15:50 Nakajima, Jun
2002-11-20 16:00 ` Steffen Persvold
2002-11-20 16:55   ` Alan Cox

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