Bad performance while transfer large block size through NFS.

[Claus Guttesen]

> I set up one NFS server, and mounted on other server by TCP. Servers
> connected with Giga network, and running 6.2-RELEASE.
>
> But I found the performance is very bad while transfering large block size data.
> For example, I use dd on NFS client to test the speed.
> And ``systat -vm 1'' is displayed HDD is most busy,
> Disks   da0
> KB/t  16.00
> tps     239
> MB/s   3.73
> % busy   91
>
> Can I do some tuning to improve large block size transfer over NFS?

Try adding read- and write-size 32768, partial /etc/fstab:

 rw,intr,nfsv3,-a=4,-w=32768,-r=32768

or adding -r 32768 -w 32768 while mounting from command line.

-- 
regards
Claus

When lenity and cruelty play for a kingdom,
the gentlest gamester is the soonest winner.

Shakespeare