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From: Andrew Morton <akpm@osdl.org>
To: Ravikiran G Thirumalai <kiran@scalex86.org>
Cc: nickpiggin@yahoo.com.au, clameter@engr.sgi.com,
	linux-kernel@vger.kernel.org, shai@scalex86.org
Subject: Re: [patch] Cache align futex hash buckets
Date: Wed, 22 Feb 2006 12:50:49 -0800	[thread overview]
Message-ID: <20060222125049.6386c9e1.akpm@osdl.org> (raw)
In-Reply-To: <20060222201713.GA3663@localhost.localdomain>

Ravikiran G Thirumalai <kiran@scalex86.org> wrote:
>
> We also collected hash collision statistics for 1024 slots.  We found that
>  50% of the slots did not take any hit!!  So maybe we should revisit the
>  hashing function before settling on the optimal number of hash slots. 

You could try switching from jhash2() to hash_long().

Was there any particular pattern to the unused slots?  Not something silly
like every second one?

  reply	other threads:[~2006-02-22 21:01 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-02-20 23:32 Ravikiran G Thirumalai
2006-02-20 23:33 ` Andrew Morton
2006-02-20 23:34   ` Andrew Morton
2006-02-21  0:09     ` Ravikiran G Thirumalai
2006-02-21  0:23       ` Andrew Morton
2006-02-21  1:04         ` Ravikiran G Thirumalai
2006-02-21  1:09           ` Andrew Morton
2006-02-21  1:39             ` Ravikiran G Thirumalai
2006-02-21 14:44             ` Andi Kleen
2006-02-21  3:30 ` Nick Piggin
2006-02-21 18:33   ` Christoph Lameter
2006-02-21 23:14     ` Christoph Lameter
2006-02-22  0:40     ` Nick Piggin
2006-02-22  2:08       ` Andrew Morton
2006-02-22  2:35         ` Ravikiran G Thirumalai
2006-02-22  2:37         ` Nick Piggin
2006-02-22 20:17           ` Ravikiran G Thirumalai
2006-02-22 20:50             ` Andrew Morton [this message]
     [not found]               ` <20060223015144.GC3663@localhost.localdomain>
2006-02-23  2:08                 ` Ravikiran G Thirumalai
2006-02-21 20:20   ` Ravikiran G Thirumalai
2006-02-22  0:45     ` Nick Piggin
2006-02-22  2:09       ` Andrew Morton

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