From: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PCI-SCI Drivers v1.1-7 released
Date: Wed, 7 Feb 2001 13:03:41 -0700 [thread overview]
Message-ID: <20010207130341.C27700@vger.timpanogas.org> (raw)
In-Reply-To: <20010207111900.E27089@vger.timpanogas.org> <E14QZvc-00013n-00@the-village.bc.nu>
In-Reply-To: <E14QZvc-00013n-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Wed, Feb 07, 2001 at 07:06:55PM +0000
On Wed, Feb 07, 2001 at 07:06:55PM +0000, Alan Cox wrote:
> > I looked into this, and discovered that the gcc 2.96 compiler turned my
> > rep movsd code into a rep movsb (???) with some evil looking C++ style
>
> If its hand coded asm then gcc shouldnt have touched it. If its an implicit
> memcpy then gcc will generate inline code designed for main memory copying.
>
> Do you have a small example chunk of code showing this ?
>
> > They deviated by 30%, indicating that my MTRR write combining optimization
> > was not working properly in sci copy mode.
>
> That would explain the %age certainly. How it happened is the next question
I'll gen some code, and send to you.
:-)
Jeff
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next prev parent reply other threads:[~2001-02-07 19:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-07 1:25 PCI-SCI Drivers v1.1-7 released Jeff V. Merkey
2001-02-07 2:06 ` Jeff V. Merkey
2001-02-07 2:07 ` [OT] " Gregory Maxwell
2001-02-07 18:08 ` Jeff V. Merkey
2001-02-07 17:32 ` Jakub Jelinek
2001-02-07 18:31 ` Jeff V. Merkey
2001-02-07 18:37 ` Tim Wright
2001-02-07 20:14 ` Jeff V. Merkey
2001-02-07 19:22 ` Alan Cox
2001-02-07 20:24 ` Jeff V. Merkey
2001-02-07 20:35 ` PCI-SCI Build Problems on RedHat 7.1 Jeff V. Merkey
2001-02-07 19:52 ` Larry
2001-02-07 9:01 ` PCI-SCI Drivers v1.1-7 released David Howells
2001-02-07 18:10 ` Jeff V. Merkey
2001-02-07 9:22 ` Alan Cox
2001-02-07 18:19 ` Jeff V. Merkey
2001-02-07 19:06 ` Alan Cox
2001-02-07 20:03 ` Jeff V. Merkey [this message]
2001-02-07 19:12 ` Alan Cox
2001-02-07 9:15 ` Alan Cox
2001-02-07 18:13 ` Jeff V. Merkey
2001-02-07 19:02 ` Alan Cox
2001-02-07 20:02 ` Jeff V. Merkey
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