From: Chuck Lever <cel@citi.umich.edu>
Subject: Re: performance problem on nfs in kernel v2.4 and v2.6
Date: Wed, 14 Dec 2005 15:16:26 -0800
Message-ID: <43A0A7CA.1020006@citi.umich.edu>
References: <20051214021641.0C18CFB045@gatekeeper.ncic.ac.cn>
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To: =?GB2312?B?s8K7tg==?= <huanchen@ncic.ac.cn>
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huanchen-

you tell us which kernels you've tried, but it's not clear
whether you are switching the client or the server kernel.

also, what export options do you use on the server?  and
what file system?


=B3=C2=BB=B6 wrote:
> nfs:
>=20
> =09
> 	I did some test on nfs in linux kernel v2.6 ,but there are some proble=
m i can't solve.
> 	I need your help!
>=20
> 	I run iozone on nfs in kernel v2.4.21 and v2.6.11.12 ,the test result =
is as follows:
> 	v2.4.21:    write performance 106MB/s   (wsize,rsize=3D8192)
> 	v2.6.11.12: write performance 52MB/s ;  (wsize,rsize=3D32768)
>=20
> 	the iozone test command I use is :=20
> 		iozone -c -e -f /mnt/nfs/file1 -s 1g -r 2m -i 0 -w
>=20
> 	My question is why the performance is lower when using v2.6?
>=20
> 	The test platform is :
> 		client: 1G memory,
> 		server: 4G memory, 146G disk. 2cpu.
> 		net: 1000Mb
>=20
> 	When i use the following command to chechk why v2.6 takes much more ti=
me, I found that the fsync operations takes much more time. the command i=
s:
> 	strace -o result -T write, close, fsync ./iozone -c -e -f /mnt/nfs/fil=
e1 -s 1g -r 2m -i 0 -w
> 	the result of this command is that the time of write is 6(ms),while th=
e time of sync before close is 6 (s).
>=20
> 	So what is wrong? how can i see performance improvement of nfs in v2.6=
. Is there any key value I can tune ?    Or the problem relates to the re=
moval of flushd while introducing  pdflush in client memory management ?
>=20
> 	Thank you!  Waiting for your reply!
>=20
>=20
> ------------------------------------------------------------
> National Research Center for Intelligent Computing Systems
> Insitute of Computing Technology
> Chinese Academy of Sciences=A1=A1=A1=A1=A1=A1
> ------------------------------------------------------------
> 	=09
>=20
> =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1
> =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1huanchen@ncic.ac.cn
> =A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A12005-12-14
>=20
>=20
>=20
>=20
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