From: Dave Jones <davej@redhat.com>
To: Rob Love <rml@ximian.com>
Cc: Mikael Pettersson <mikpe@csd.uu.se>,
szepe@pinerecords.com, akpm@osdl.org,
linux-kernel@vger.kernel.org
Subject: Re: Pentium M config option for 2.6
Date: Sun, 4 Jan 2004 16:25:16 +0000 [thread overview]
Message-ID: <20040104162516.GB31585@redhat.com> (raw)
In-Reply-To: <1073228608.2717.39.camel@fur>
On Sun, Jan 04, 2004 at 10:03:28AM -0500, Rob Love wrote:
> On Sun, 2004-01-04 at 07:27, Mikael Pettersson wrote:
> > And since P-M doesn't do SMP, does cache line size even
> > matter? There are no locks to protect from ping-ponging.
>
> Cache line size does still come into the picture on UP, albeit not as
> much as with SMP - but e.g. it still matters to things like device
> drivers doing DMA.
Regardless, Tomas's patch changed CONFIG_X86_L1_CACHE_SHIFT for
that CPU, and CONFIG_X86_L1_CACHE_SHIFT shouldn't affect this.
The cacheline size is determined at boottime using the code in
pcibios_init() and set using pci_generic_prep_mwi().
The config option is the default that pci_cache_line_size starts at,
but this gets overridden when the CPU type is determined.
Dave
--
Dave Jones http://www.codemonkey.org.uk
next prev parent reply other threads:[~2004-01-04 16:25 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-04 12:27 Pentium M config option for 2.6 Mikael Pettersson
2004-01-04 12:33 ` Tomas Szepe
2004-01-06 6:07 ` Jakob Oestergaard
2004-03-29 15:46 ` Jakob Oestergaard
2004-01-04 15:03 ` Rob Love
2004-01-04 16:25 ` Dave Jones [this message]
2004-01-04 16:33 ` Rob Love
2004-01-04 16:50 ` Dave Jones
2004-01-04 17:01 ` Rob Love
2004-01-04 17:14 ` Tomas Szepe
2004-03-29 15:42 ` Tomas Szepe
2004-01-04 17:03 ` Troels Walsted Hansen
2004-01-04 17:35 ` Dave Jones
2004-01-04 21:51 ` Vojtech Pavlik
2004-03-29 15:42 ` Rob Love
2004-01-04 20:34 ` Valdis.Kletnieks
2004-01-04 21:55 ` Vojtech Pavlik
2004-01-04 23:37 ` Valdis.Kletnieks
2004-03-29 15:42 ` Dave Jones
2004-03-29 15:42 ` Rob Love
2004-03-29 15:42 ` Dave Jones
2004-03-29 15:42 ` Tomas Szepe
2004-03-29 15:42 ` Rob Love
-- strict thread matches above, loose matches on Subject: below --
2004-03-29 15:42 Mikael Pettersson
2004-03-29 15:42 Mikael Pettersson
2004-01-05 15:09 Amit Gurdasani
2004-01-05 15:22 ` Tim Schmielau
2004-01-04 14:10 Mikael Pettersson
2004-01-04 14:43 ` Tomas Szepe
2004-01-04 15:59 ` Ciaran McCreesh
2004-03-29 15:42 ` Ciaran McCreesh
2004-03-29 15:42 ` Tomas Szepe
2004-01-04 2:28 Tomas Szepe
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