Re: NFS speed problem when appending data to existing files

Re: NFS speed problem when appending data to existing files

[Bernd Schubert]

> on the client side (2.4.22, server is a 2.4.21 kernel based nfsd). Only
> appending small amounts of data to an existing file shows the problem.
> Writing a large file happens at FastEthernet speed flawlessly. Any help,
> please?
> 

Hello Torsten,

2.4.22 has a client-side nfs-bug causing this. I'm not sure if this is already 
fixed in 2.4.23-pre6, so I suggest you downgrade to 2.4.21.

Cheers,
	Bernd

Re: NFS speed problem when appending data to existing files

[Torsten Werner]

Hello Bernd,

On 2003-10-09, Bernd Schubert wrote:
> 2.4.22 has a client-side nfs-bug causing this. I'm not sure if this is
> already fixed in 2.4.23-pre6, so I suggest you downgrade to 2.4.21.

Thanks, that does avoid the error messages in the kernel log but it does
not solve the problem. You can download a strace log from
http://twerner.debian.net/strace.out.bz2 . You will see a programm that
repeatedly opens a file in append mode, writes some data and closes the
file. Sometimes the close need overs half a second which is far to much.
(Please just 'grep close strace.out' to see it clearly.)

It did work with some older kernel that I have already deinstalled. :-(

Regards,
Torsten

-- 
Torsten Werner                         Dresden University of Technology
email@twerner42.de                   +49 351 46336711 / +49 162 3123004
http://www.twerner42.de/                      telefax: +49 351 46336809

NFS speed problem when appending data to existing files

[Torsten Werner]

Hello,

the following command

for i in `seq 1 10240`; do dd if=/dev/zero bs=100 count=1 2> /dev/null | tee -a tmp0; done

is very slow on a nfs mounted homedir and I get lots of error messages

nfs: server xxxxxx not responding, still trying
nfs: server xxxxxx OK

on the client side (2.4.22, server is a 2.4.21 kernel based nfsd). Only
appending small amounts of data to an existing file shows the problem.
Writing a large file happens at FastEthernet speed flawlessly. Any help,
please?

Thanks,
Torsten

-- 
Torsten Werner                         Dresden University of Technology
email@twerner42.de                   +49 351 46336711 / +49 162 3123004
http://www.twerner42.de/                      telefax: +49 351 46336809