From: Mark Mielke <mark@mark.mielke.cc>
To: Samuel Flory <sflory@rackable.com>
Cc: mcuss@cdlsystems.com, jamesclv@us.ibm.com,
root@chaos.analogic.com, linux-kernel@vger.kernel.org
Subject: Re: Kernel reports 4 CPUS instead of 2...
Date: Wed, 16 Oct 2002 17:44:55 -0400 [thread overview]
Message-ID: <20021016214455.GA9624@mark.mielke.cc> (raw)
In-Reply-To: <3DADD064.8010707@rackable.com>
On Wed, Oct 16, 2002 at 01:47:32PM -0700, Samuel Flory wrote:
> Try shutting off hyperthreading in the bios. Keep in mind
> hyperthreading is net loss if you are running a single nonthreaded app.
> Also you might want to check if there aren't io speed issues.
Is this true? It seems to me that the 'on-demand execution units' would
simply be devoted to the one task, resulting in zero loss.
I see hyperthreading becoming a problem if two threads are scheduled to
execute at the same time before the operating system, and if they each
need access to the same execution units at the same time.
mark
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next prev parent reply other threads:[~2002-10-16 21:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-16 17:24 Kernel reports 4 CPUS instead of 2 Mark Cuss
2002-10-16 17:35 ` Richard B. Johnson
2002-10-16 17:56 ` Samuel Flory
2002-10-16 17:54 ` Richard B. Johnson
2002-10-16 18:14 ` Samuel Flory
2002-10-16 19:28 ` James Cleverdon
2002-10-16 19:44 ` Mark Cuss
2002-10-16 20:10 ` Richard B. Johnson
2002-10-16 20:47 ` Samuel Flory
2002-10-16 21:44 ` Mark Mielke [this message]
2002-10-16 22:14 ` Samuel Flory
2002-10-16 22:21 ` Mark Cuss
2002-10-16 18:37 ` Mark Cuss
2002-10-16 23:21 ` Bryan Whitehead
2002-10-17 0:34 ` Mark Chernault
2002-10-17 12:56 ` Richard B. Johnson
2002-10-17 14:19 ` Dave Jones
2002-10-17 17:15 ` Bryan B Whitehead
2002-10-16 17:37 ` Joel Jaeggli
2002-10-16 17:48 ` Mark Cuss
2002-10-16 17:44 ` FD Cami
-- strict thread matches above, loose matches on Subject: below --
2002-10-16 18:08 Nakajima, Jun
2002-10-17 1:02 Matt_Domsch
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