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Date: Tue, 17 Jan 2006 13:24:27 -0500 (EST)
From: Justin Piszcz <jpiszcz@lucidpixels.com>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: Tomasz =?iso-8859-2?Q?K=B3oczko?= <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!?
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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=20
definitely see all sorts of weird issues.


On Tue, 17 Jan 2006, Alan Cox wrote:

> On Maw, 2006-01-17 at 18:48 +0100, Tomasz K=C5=82oczko 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.
>
>
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