Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

The /etc/fstab entry used by my nfs client is {server_ip}:/home/{server_user}/{server_path} /home/{client_user}/{client_path}

I wanted to know the rsize and wsize values used by default. I wanted to try out some benchmarks with various values smaller and larger than the default values so that i can arrive at an optimum value for my read heavy setup.

share|improve this question
up vote 5 down vote accepted

Don't modify rsize and wsize. Recent NFS servers and clients will work out the best value for you and will probably do a better job than you would as well. :)

share|improve this answer

If you are on a Linux box, take a look at /proc/mounts. You'll find the current value there. If you specify no value in /etc/fstab, that will be the default (or at least, a value that is considered sane by the system).

share|improve this answer

These are the options we use most of the time


share|improve this answer
but nobody explain why use that parameter, this is my default rsize and wsize from my workstation [root@worktux ~]# grep nfs /proc/mounts /mnt nfs rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600‌​,retrans=2,sec=sys,mountaddr=,mountvers=3,mountport=20048,mountpro‌​to=udp,local_lock=none,addr= 0 0 – c4f4t0r Jun 8 '14 at 19:55

I believe the default rsize and wsize are 8192 for both UDP and TCP mounts.

share|improve this answer
This isn't the case on recent distributions. – unop Nov 27 '15 at 22:18

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.