On Tue, 2008-12-16 at 22:40 +0100, Davide Cittaro wrote: > Hi all, after some double checks and test I still have CentOS nfs > client performance not exciting... Just for the record nfs server is > Solaris 10. With CentOs client I reach at most ~ 80 MB/s on a gigabit > ethernet... I should be satisfied, as it is close to real-world > ethernet performance. Nevertheless I have ~100 MB/s with other linux > clients (not CentOS). The mount options are the same on CentOS and on > Gentoo... > > rw > ,nosuid > ,vers > = > 3 > ,rsize > =1048576,wsize=1048576,hard,noacl,proto=tcp,timeo=600,retrans=2,sec=sys > > Also, I've tried another NFS server based on FreeBSD > > rw > ,vers > =3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys > > (options are results of nfsstat -m). > I have ~74 MB/s on Gentoo and 52 MB/s on CentOS... > I've tried many wsize/rsize, a bunch of different mount options, but > still I can't outperform those values... ---- larger rsize/wsize values do not necessarily translate to faster and I was of the opinion that going over 65536 wasn't going to help at all. With some NFS servers, a smaller rsize/wsize is better. (8192 or 16384) but that is the point of tuning I suppose. hubs/switches, wires and the network cards themselves all can impact performance - it's not necessarily CentOS itself. Craig