From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Alain Tesio <alain@onesite.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: HIGHMEM=4G slows down ps2pdf with 2.4.28
Date: Mon, 6 Dec 2004 17:43:31 -0200 [thread overview]
Message-ID: <20041206194331.GC2282@dmt.cyclades> (raw)
In-Reply-To: <20041206184118.GA2282@dmt.cyclades>
On Mon, Dec 06, 2004 at 04:41:18PM -0200, Marcelo Tosatti wrote:
> On Fri, Dec 03, 2004 at 09:58:19PM +0100, Alain Tesio wrote:
> > On Thu, 2 Dec 2004 17:08:15 -0200
> > Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
> >
> > > On Wed, Dec 01, 2004 at 11:25:22PM +0100, Alain Tesio wrote:
> > > > Hi,
> > > >
> > > > With a 2.4.28 kernel, 1.5 Go RAM and nothing exotic, everything works fine
> > > > with CONFIG_HIGHMEM4G and CONFIG_HIGHMEM=y except that
> > > > ps2pdf is about 30 times slower
> >
> > > How does /proc/mtrr look like?
> > >
> > > Maybe some of your memory is configured as uncacheable.
> >
> > reg00: base=0x00000000 ( 0MB), size=1024MB: write-back, count=1
> > reg01: base=0x40000000 (1024MB), size= 256MB: write-back, count=1
> > reg02: base=0x50000000 (1280MB), size= 128MB: write-back, count=1
> > reg03: base=0x58000000 (1408MB), size= 64MB: write-back, count=1
> > reg04: base=0x5c000000 (1472MB), size= 32MB: write-back, count=1
> > reg05: base=0x5e000000 (1504MB), size= 16MB: write-back, count=1
> >
> > I don't think that the hosting company played with the bios settings,
> > and I don't do anything special with memory.
>
> Alain,
>
> All memory is correctly configured in MTRR it seems (all of it is write-back cacheable).
>
> Do you have CONFIG_HIGHIO=y ? That might help a lot. The kernel has to use
> bounce buffers for IO otherwise.
However you report 30x slower without HIGHMEM - thats a bit too much for
the added overhead of bounce buffers. Anyway, try CONFIG_HIGHIO=y if you
dont have it configured this way.
prev parent reply other threads:[~2004-12-07 1:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-01 22:25 HIGHMEM=4G slows down ps2pdf with 2.4.28 Alain Tesio
2004-12-02 19:08 ` Marcelo Tosatti
2004-12-03 20:58 ` Alain Tesio
2004-12-06 18:41 ` Marcelo Tosatti
2004-12-06 19:43 ` Marcelo Tosatti [this message]
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