Re: Kernel 2.6.15.1 + NFS is 4 times slower than FTP!?

[Justin Piszcz <jpiszcz@lucidpixels.com>]

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.


On Tue, 17 Jan 2006, Alan Cox wrote:

> 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.