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SubjectRe: Speed of memcpy, csum_partial and csum_partial_copy
   Date: 	Sat, 8 Jun 1996 20:21:15 +0300 (EET DST)
From: Linus Torvalds <>

On Sat, 8 Jun 1996, Alan Cox wrote:

> Several people have sped the checksum/copy code up over time. If you can
> speed it further then you will be number 4, and since the performance of
> these routines is very critical then the patches will be welcome.

Just to show exactly _how_ important, here's some profiling info of a
machine that has been busy doing TCP over loopback (everything >= 0.5%

Linus, is there any possibility of putting the FPU memcpy into 2.1 as
an experimental feature? I've gotten a lot of good feedback from the
pentium-memcpy list (the only person who's been having problems is on
an SMP).

Robert Krawitz <>

Member of the League for Programming Freedom -- mail
Tall Clubs International -- or 1-800-521-2512

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