netdev - Re: [PATCH] NET : change layout of ehash table

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Message-Id: <20070209.004019.75431263.davem@davemloft.net>
Date:	Fri, 09 Feb 2007 00:40:19 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ak@...e.de
Cc:	dada1@...mosbay.com, linux@...izon.com, akepner@....com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] NET : change layout of ehash table

From: Andi Kleen <ak@...e.de>
Date: 09 Feb 2007 10:18:03 +0100

> David Miller <davem@...emloft.net> writes:
> > 
> > I've applied this, but I _REALLY_ don't like the new multiply
> > instructions that are used now in the hash indexing paths when
> > CONFIG_SMP is set.
> > 
> > I think that's a higher cost than the memory waste.
> 
> You're serious? multiply on a modern CPU is _much_ cheaper than a cache miss
> e.g. a K8 can do a arbitary 64bit multiplication in 3-7 cycles.
> Any cache miss will be in the three to four digits at least.

I'm not thinking of modern CPUs, I'm think of the little
guys :-)
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