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Subject: Re: Performance improvement inquiry
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Zapp Foster <zzaappp@yahoo.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 12 Oct 2002 22:33:34 +0100
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On Sat, 2002-10-12 at 21:26, Zapp Foster wrote:
> First question:  Will compiling a kernel with
> the network module resident (as opposed to a loadable
> module) make network performance any better?  From
> the reading, it appears that resident modules are only
> faster in initialization, not runtime.  I'm new to
> this, so please correct me if I'm wrong.

Modules are very very fractionally slower than compiled in code due to
TLB misses
 
> Second:  Threads.  Each server runs one to several
> custom services I've written, each of which performs a
> part of data processing on the incoming data.  Each
> service consists of eight to thirty threads.  The
> question:  Is there a way to tweak the kernel to
> improve thread performance?  I hear the 2.5 kernel 

Update to the RH 7.3 kernel and you will get the O(1) scheduler too

> how likely it is that shared libs (used either by my
> services or the kernel/OS) are being re-read from
> disk?  I am hoping that the libs get cached and thus
> load from cache back into memory.

They do


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