[NFS] sync, async, write speeds.

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Hello all,

I'm using NFS to mount /home on a gigabit network.
/etc/exports on the server
/home  192.168.2.48/255.255.255.248(rw,no_root_squash,sync,no_subtree_check)

/proc/mount on the client
home_server:/home /home nfs
rw,vers=3,rsize=32768,wsize=32768,hard,nointr,proto=tcp,timeo=600,retrans=2,sec=sys,addr=192.168.2.22
0 0

Write performance is not good.

dd if=/dev/zero of=/home/testfile bs=16k count=16384
268435456 bytes (268 MB) copied, 45.0461 seconds, 6.0 MB/s

If I change the export to async, it improves a lot.

dd if=/dev/zero of=./testfile bs=16k count=16384
268435456 bytes (268 MB) copied, 3.6 seconds, 74.4 MB/s

But the recommendation is not to use async, right?

I've tried the same thing on two different servers (one xenified
kernel, one stock etch kernel) and two different clients (ubuntu 7.10
y debian etch), with the same results. :(
Where should I start looking to fix this?

Thanks.
Chris.

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