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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Tomasz Kłoczko" <kloczek@rudy.mif.pg.gda.pl>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>,
	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 18:11:23 +0000	[thread overview]
Message-ID: <1137521483.14135.59.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.BSO.4.63.0601171846570.15077@rudy.mif.pg.gda.pl>

On Maw, 2006-01-17 at 18:48 +0100, Tomasz Kłoczko wrote:
> > I wonder how much faster NFS over TCP would be, or if NFS in the kernel is 
> > the problem itself?
> 
> On Linux NFS over TCP is slower than over UDP ~10%.

For the specific case you measured. Its never quite that simple because
behaviour over different networks and error patterns varies a lot and
TCP can be a big win on loaded networks or under error conditions,
especially packet loss, where fragmentation losses kill throughput on
UDP.



  reply	other threads:[~2006-01-17 18:12 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 [this message]
2006-01-17 18:24         ` Justin Piszcz
2006-01-17 18:33           ` Alan Cox
2006-01-17 18:37           ` Trond Myklebust
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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