linux-kernel - Re: [PATCH] dcache: better name hash function

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Message-Id: <20091026.222428.80364204.davem@davemloft.net>
Date:	Mon, 26 Oct 2009 22:24:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	stephen.hemminger@...tta.com
Cc:	eric.dumazet@...il.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, opurdila@...acom.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH] dcache: better name hash function

From: Stephen Hemminger <stephen.hemminger@...tta.com>
Date: Mon, 26 Oct 2009 22:19:44 -0700 (PDT)

> How important is saving the one division, versus getting better
> distribution.

80 cpu cycles or more on some processors.  Cheaper to use
jenkins with a power-of-2 sized hash.
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