From owner-freebsd-stable@FreeBSD.ORG  Wed Nov 26 16:44:04 2008
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Date: Thu, 27 Nov 2008 00:21:00 +0800
From: "Lin Jui-Nan Eric" <ericlin@tamama.org>
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Subject: NFS Performance Issue
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Hi Listers,

We recently found that the Performance of the NFS Client in FreeBSD is
worse than that in Linux.

Linux [/net/iscsi] -jnlin- sudo ls -al
/net/iscsi/mysql/blog-2/var/pixblog_2/blogarticle.ibd
-rw-rw---- 1 3306 3306 734003200 2008-11-27 00:13
/net/iscsi/mysql/blog-2/var/pixblog_2/blogarticle.ibd

Linux [/net/iscsi] -jnlin- uname -a
Linux proxy 2.6.22.6-Linux #1 Mon Sep 3 11:54:48 CST 2007 i686 GNU/Linux

Linux [/net/iscsi] -jnlin- sudo rsync --progress
/net/iscsi/mysql/blog-2/var/pixblog_2/blogarticle.ibd /tmp/
blogarticle.ibd
   734003200 100%   15.16MB/s    0:00:46 (xfer#1, to-check=0/1)

FreeBSD [/net/iscsi] -jnlin- uname -a
FreeBSD newphp 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #3: Tue Nov 25
15:55:33 CST 2008     root@FreeBSD:/usr/obj/usr/src/sys/KERNEL  i386

FreeBSD [/net/iscsi] -jnlin-  sudo rsync --progress
/net/iscsi/mysql/blog-2/var/pixblog_2/blogarticle.ibd /tmp/
blogarticle.ibd
   734003200 100%    5.66MB/s    0:02:03 (xfer#1, to-check=0/1)

It's about 1/3 of NFS client in Linux. We have tuned TCP recv/send
buffer, and got no gain. The mount parameters are: (We use amd)
rw,nfsv3,lockd,grpid,intr,soft,cache,nodev,resvport,timeo=10,retrans=3,async,rsize=1024,wsize=1024,noatime

Does anyone has any suggestion to get the performance better? Thank you all!