netdev - Re: [PATCH] INET : removes per bucket rwlock in tcp/dccp ehash table

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Message-Id: <200711050001.03699.ak@suse.de>
Date:	Mon, 5 Nov 2007 00:01:03 +0100
From:	Andi Kleen <ak@...e.de>
To:	David Miller <davem@...emloft.net>
Cc:	dada1@...mosbay.com, netdev@...r.kernel.org, acme@...hat.com,
	jarkao2@...pl
Subject: Re: [PATCH] INET : removes per bucket rwlock in tcp/dccp ehash table

On Sunday 04 November 2007 22:56:21 David Miller wrote:
> From: Andi Kleen <ak@...e.de>

> This makes a huge different as we have to set NR_CPUS to 4096
> in order to handle the cpu numbering of some UltraSPARC-IV
> machines.

Really? Hopefully you have a large enough stack then. There 
are various users who put char str[NR_CPUS] on the stack
and a few other data structures also get incredibly big with
NR_CPUS arrays.

If it's for sparse cpu ids -- x86 handles those with an 
translation array.

-Andi
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