client: 2.6.7 client much slower than 2.4.26

[Bernd Schubert <bernd-schubert@web.de>]

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Hi,

I'm currently testing 2.6.7 on one of our clients and the nfs transfer is much 
slower than when the same system is running 2.4.X

Well, the usual suggestion probably would be to run nfs over tcp now, but tcp 
is already enabled (from /proc/mounts):

taylor:/worka /mnt/test nfs 
rw,v3,rsize=32768,wsize=32768,hard,tcp,lock,addr=taylor 0 0

benchmarks:

copy a file to the server (2.6.7): ~ 3MB/s
copy a file to the server (2.4.26): ~ 9MB/s

copy a file from the server (2.6.7): ~ 3MB/s
copy a file from the server (2.4.26): ~ 11MB/s

The filesize was 300MB.


Here's the nfsstat output:

euklid:~# nfsstat
Client rpc stats:
calls      retrans    authrefrsh
385466     0          0
Client nfs v2:
null       getattr    setattr    root       lookup     readlink
0       0% 27475  66% 231     0% 0       0% 3963    9% 161     0%
read       wrcache    write      create     remove     rename
8303   20% 0       0% 560     1% 171     0% 198     0% 42      0%
link       symlink    mkdir      rmdir      readdir    fsstat
45      0% 0       0% 3       0% 3       0% 129     0% 2       0%

Client nfs v3:
null       getattr    setattr    lookup     access     readlink
0       0% 56851  16% 1047    0% 17711   5% 36670  10% 936     0%
read       write      create     mkdir      symlink    mknod
73640  21% 149802 43% 629     0% 86      0% 1       0% 0       0%
remove     rmdir      rename     link       readdir    readdirplus
701     0% 105     0% 279     0% 36      0% 464     0% 1557    0%
fsstat     fsinfo     pathconf   commit
260     0% 18      0% 0       0% 3387    0%


I already tried to reduce rsize and wsize up to 1024, but this didn't change 
anything.

This happens to two different servers, one server is running 2.6.7 and has 
Gigabit connection to the switch. The other server is running 2.4.25 and only 
has a 100MBit connection. All of our clients have 100MBit connections.

So I really thing this is a client problem. Well, the client is not the 
fastest of our systems (PII 450), but with 2.4.X it has the usual speed. Its 
also interesting top is showing that the rpciod is taking all cpu-time when 
copying a file to the server.

Any ideas whats going on?

Thanks,
	Bernd

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