[CentOS] nfs slow?

Craig White craigwhite at azapple.com
Tue Dec 16 22:49:05 UTC 2008

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.


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