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

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Message-ID: <4AE6A16F.4020002@gmail.com>
Date:	Tue, 27 Oct 2009 08:29:51 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Octavian Purdila <opurdila@...acom.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] dcache: better name hash function

Eric Dumazet a écrit :
> 
> 
> 511 value on 64bit, and 1023 on 32bit arches are nice because
> hashsz * sizeof(pointer) <= 4096, wasting space for one pointer only.
> 
> Conclusion : jhash and 511/1023 hashsize for netdevices,
> no divides, only one multiply for the fold.

Just forget about 511 & 1023, as power of two works too.

-> 512 & 1024 + jhash

Guess what, David already said this :)
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