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From: Willy Tarreau <willy@w.ods.org>
To: Chuck Lever <cel@citi.umich.edu>
Cc: Marcelo Tosatti <marcelo@conectiva.com.br>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.4 read ahead never reads the last page in a file
Date: Sat, 6 Dec 2003 09:20:11 +0100	[thread overview]
Message-ID: <20031206082011.GD11325@alpha.home.local> (raw)
In-Reply-To: <Pine.BSO.4.33.0312031800270.24127-100000@citi.umich.edu>

Hi Chuck,

I've run 2.4.23 both vanilla and patched, and I confirm a win on NFS reads.
I tested from 1 to 6 parallel reads consisting of md5sum of kernel includes :
  time find include -type f | xargs md5sum >/dev/null &
Results below :

processes   2.4.23       2.4.23-patched
    1       11.5         11.45
    2       12.82        12.68
    3       14.7         14.4
    4       17.8         17.3
    5       21.5         21.0
    6       25.7         25.0  => server is saturated 100% sys
    7       29.3         29.0  => server is saturated 100% sys

Fileset contain 7346 files totalizing 29952 kB.
So there's a gain of nearly 3% in the best case (6 processes). Not bad.
I suspect that I could also gain slightly more by patching the server too.

Cheers,
Willy


      parent reply	other threads:[~2003-12-06  8:24 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-03 23:10 [PATCH] 2.4 read ahead never reads the last page in a file Chuck Lever
2003-12-05  1:32 ` Andrea Arcangeli
2003-12-05 15:51   ` Marcelo Tosatti
2003-12-05  1:54 ` Mike Fedyk
2003-12-06  8:20 ` Willy Tarreau [this message]

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