From: "David S. Miller" <davem@redhat.com>
To: manand@us.ibm.com
Cc: linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net
Subject: Re: efficient copy_to_user and copy_from_user routines in Linux Kernel
Date: Mon, 24 Jun 2002 12:33:56 -0700 (PDT) [thread overview]
Message-ID: <20020624.123356.82809701.davem@redhat.com> (raw)
In-Reply-To: <OFCB119CD8.D6AE7B3D-ON85256BE2.006AC911@raleigh.ibm.com>
From: "Mala Anand" <manand@us.ibm.com>
Date: Mon, 24 Jun 2002 14:34:08 -0500
The 2.5.19 copy routines use the movsl instruction. We found that when the
src or dst addresses are not aligned on 8 bytes, performance can be
improved
by using the integer registers instead of the movsl instruction. For
tcpip,
the src or dst addresses are often misaligned.
If the code is going to become so much larger, move the implementation
out of the header file and into arch/i386/lib/foo.S
It makes no sense to inline it anymore if it is going to be
implemented with so many instructions.
next prev parent reply other threads:[~2002-06-24 19:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-24 19:34 efficient copy_to_user and copy_from_user routines in Linux Kernel Mala Anand
2002-06-24 19:33 ` David S. Miller [this message]
2002-06-24 20:24 ` [Lse-tech] " Niels Christiansen
2002-06-25 17:03 ` Andrew Morton
2002-06-25 17:43 ` kuznet
2002-06-25 19:47 ` Andrew Morton
2002-06-25 21:46 ` Chris Friesen
2002-06-26 13:54 ` Hirokazu Takahashi
2002-06-25 18:58 ` [Lse-tech] " Niels Christiansen
2002-06-25 19:11 ` Dave Jones
2002-06-26 12:58 ` Andi Kleen
2002-06-26 14:50 ` Bill Hartner
-- strict thread matches above, loose matches on Subject: below --
2002-06-28 11:50 Mala Anand
2002-06-28 12:35 Mala Anand
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