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From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>,
	"Tomasz Kłoczko" <kloczek@rudy.mif.pg.gda.pl>,
	"Phil Oester" <kernel@linuxace.com>,
	linux-kernel@vger.kernel.org, apiszcz@lucidpixels.com
Subject: Re: Kernel 2.6.15.1 + NFS is 4 times slower than FTP!?
Date: Tue, 17 Jan 2006 13:37:14 -0500	[thread overview]
Message-ID: <1137523035.7855.91.camel@lade.trondhjem.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0601171324010.25508@p34>

On Tue, 2006-01-17 at 13:24 -0500, Justin Piszcz wrote:
> Alan, is it normal for FTP to be 2x as fast as NFS?
> With 100mbps, I never seemed to have any issues, but with GIGABIT I 
> definitely see all sorts of weird issues.

Reading or writing?

The readahead algorithm has been borken in 2.6.x for at least the past 6
months. It leads to NFS collapsing down to 4k reads on the wire instead
of doing 32k or 64k.
An effort was made to look at fixing this, but it turns out that nobody
really understands the current messy implementation, and so progress has
been slow.

Cheers,
  Trond


  parent reply	other threads:[~2006-01-17 18:37 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-17  1:07 Kernel 2.6.15.1 + NFS is 4 times slower than FTP!? Justin Piszcz
2006-01-17  1:23 ` Phil Oester
2006-01-17  1:32   ` Justin Piszcz
2006-01-17 17:48     ` Tomasz Kłoczko
2006-01-17 18:11       ` Alan Cox
2006-01-17 18:24         ` Justin Piszcz
2006-01-17 18:33           ` Alan Cox
2006-01-17 18:37           ` Trond Myklebust [this message]
2006-01-17 18:38             ` Justin Piszcz
2006-01-17 18:53               ` Trond Myklebust
2006-01-17 18:55                 ` Justin Piszcz
2006-01-17 19:01                   ` Trond Myklebust
2006-01-17 19:03                     ` Justin Piszcz
2006-01-17 20:39                     ` Jan Engelhardt
2006-01-17 20:45                       ` Justin Piszcz
2006-01-17 22:07                         ` Jan Engelhardt
2006-01-17 22:13                           ` Lee Revell
2006-01-17 23:19                             ` Justin Piszcz
2006-01-17 23:39                               ` Lee Revell
2006-01-18  0:43                                 ` Trond Myklebust
2006-01-17  9:50   ` Justin Piszcz
2006-01-17 17:10     ` Jan Engelhardt

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