linux-kernel - Re: [PATCH v7 09/16] SUNRPC/cache: use new hashtable implementation

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Date:	Mon, 29 Oct 2012 09:27:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Sasha Levin <levinsasha928@...il.com>, tj@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	paul.gortmaker@...driver.com, davem@...emloft.net,
	rostedt@...dmis.org, mingo@...e.hu, ebiederm@...ssion.com,
	aarcange@...hat.com, ericvh@...il.com, netdev@...r.kernel.org,
	josh@...htriplett.org, eric.dumazet@...il.com, axboe@...nel.dk,
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	dev@...nvswitch.org, rds-devel@....oracle.com, lw@...fujitsu.com
Subject: Re: [PATCH v7 09/16] SUNRPC/cache: use new hashtable implementation

On Mon, 29 Oct 2012 07:49:42 -0700 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> Because there's no reason to believe that '9' is in any way a worse
> random number than something page-shift-related, is there?

9 is much better than PAGE_SHIFT.  PAGE_SIZE can vary by a factor of
16, depending on config.

Everyone thinks 4k, and tests only for that.  There's potential for
very large performance and behavior changes when their code gets run
on a 64k PAGE_SIZE machine.
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