Bad performance while transfer large block size through NFS.

hshh hunreal at gmail.com
Sat Jun 2 12:13:18 UTC 2007


I tried, but not help.
Still only 3798612 bytes/sec while block size is 2MBytes.

On 6/1/07, Claus Guttesen <kometen at gmail.com> wrote:
> > 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
>


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