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Re: help offered

To: ariel@cthulhu.engr.sgi.com
Subject: Re: help offered
From: alan@lxorguk.ukuu.org.uk (Alan Cox)
Date: Wed, 25 Nov 1998 21:46:54 +0000 (GMT)
Cc: galibert@pobox.com, linux@cthulhu.engr.sgi.com
In-reply-to: <199811252037.MAA37649@oz.engr.sgi.com> from "Ariel Faigon" at Nov 25, 98 12:37:36 pm
Sender: owner-linux@cthulhu.engr.sgi.com
> :Linux 2.1.* is very preemtible, even if there are  stil some things to
> :do.

Umm

> :
> 
> Interesting.  Could you elaborate on:
> 
>       0) What was changed in recent Linux kernels
>          to support preemtibility in kernel space?

Nothing

>       1) Which "serious" (i.e not 'getpid') system calls are
>          now reentrant ?

signals, scheduling related stuff

>       2) What still remains to be done so Linux can really
>          scale before it gets bottlenecked by kernel locks ?

Actually it scales fine to 4 CPUs for most stuff on Intel. The pieces that
dont scale are memory intensive and the intel hardware doesnt scale either 8)

But from a theoretical point of view the page cache, vm and fs layers
dont scale.

Alan


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