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From: Jeff Layton <jlayton@redhat.com>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Andrew Morton <akpm@osdl.org>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] i_ino uniqueness: alternate approach -- hash the inodes
Date: Wed, 24 Jan 2007 11:57:29 -0500	[thread overview]
Message-ID: <45B78FF9.40202@redhat.com> (raw)
In-Reply-To: <200701241621.44923.dada1@cosmosbay.com>

Eric Dumazet wrote:
 > The problem is you wont see the overhead of insert/delete the inode in a
 > global tree, since you keep hot caches.
 >
 > To have a better estimate of the overhead, I suggest you try to use more
 > active pipes like :
 >

Eric, thanks for the new program. With that, the situation looks slightly
worse:

hashing patch (pipebench):
sys     1m15.329s
sys     1m16.249s
sys     1m17.169s

unpatched (pipebench):
sys     1m9.836s
sys     1m12.541s
sys     1m14.153s

Which works out to 1.05642174294555027017. So ~5-6%.

-- Jeff


  reply	other threads:[~2007-01-24 16:58 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-16 18:57 Jeff Layton
2007-01-24  4:46 ` Andrew Morton
2007-01-24 14:22   ` Jeff Layton
2007-01-24 15:21     ` Eric Dumazet
2007-01-24 16:57       ` Jeff Layton [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-01-08 20:46 Jeff Layton
2007-01-10 20:58 ` Eric Sandeen
2006-12-29 19:10 Jeff Layton

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