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From: Valdis.Kletnieks@vt.edu
To: lsorense@csclub.uwaterloo.ca (Lennart Sorensen)
Cc: Sunil Naidu <akula2.shark@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: Choosing a HyperThreading/SMP/MultiCore kernel ?
Date: Sat, 13 Jan 2007 21:21:24 -0500	[thread overview]
Message-ID: <200701140221.l0E2LOYS010969@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Sat, 13 Jan 2007 12:54:43 EST." <20070113175443.GX17267@csclub.uwaterloo.ca>

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On Sat, 13 Jan 2007 12:54:43 EST, Lennart Sorensen said:
> On Fri, Jan 12, 2007 at 10:38:43PM -0500, Valdis.Kletnieks@vt.edu wrote:
> > CONFIG_MCORE2=y
> 
> Oh good.  Makes life much simpler for users.

After writing that, I actually went back and *checked* the fine print.
It turns out that unless you have installed a not-yet-escaped release of
gcc, -mtune=core2 doesn't work, so it punts to -mtune=generic.  Wandering
over to http://gcc.gnu.org and searching the mailing lists, it seems that
on most of the benchmarks, -mtune=core2 was only a 0.5% or so win on most
stuff in its current form.

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  reply	other threads:[~2007-01-14  2:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-12 13:25 Sunil Naidu
2007-01-12 15:03 ` Lennart Sorensen
2007-01-12 23:21   ` Sunil Naidu
2007-01-12 23:29     ` Paul Jackson
2007-01-13  3:38   ` Valdis.Kletnieks
2007-01-13 12:07     ` Stefan Richter
2007-01-13 17:54     ` Lennart Sorensen
2007-01-14  2:21       ` Valdis.Kletnieks [this message]
2007-01-20  3:45       ` Sunil Naidu
2007-01-13 20:18     ` Bill Davidsen
2007-01-14  1:55       ` Valdis.Kletnieks
2007-01-14 15:52         ` Bill Davidsen

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