From: "=?GB2312?Q?=B3=C2=BB=B6?=" <huanchen@ncic.ac.cn>
Subject: Re: Re: performance problem on nfs in kernel v2.4 and v2.6
Date: Thu, 15 Dec 2005 9:12:20 +0800
Message-ID: <20051215011405.3037CFB047@gatekeeper.ncic.ac.cn>
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Cc: nfs@lists.sourceforge.net <nfs@lists.sourceforge.net>
To: cel@citi.umich.edu <cel@citi.umich.edu>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

Chuck Lever,=C4=FA=BA=C3=A3=A1

=09when i did test on kernel 2.4.21, both client and server are of=
 that kernel version. So i did on kernel 2.6.11.12.

=09the export option i use is :=
 =09(rw,async,wdelay,hide,nocrossmnt,secure,no_root_squash,no_all_s=
quash,subtree_check,secure_locks,mapping=3Didentity,anonuid=3D-2,anon=
gid=3D-2)

=09the filesystem is ext2.

=09why i can't test the good performance i expected on v2.6.?

=3D=3D=3D=3D=3D=3D=3D 2005-12-14 15:16:00 =C4=FA=D4=DA=C0=B4=D0=C5=D6=D0=D0=B4=B5=C0=A3=BA=3D=3D=3D=3D=3D=3D=3D

>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:
>> 
>> =09
>> =09I did some test on nfs in linux kernel v2.6 ,but there are=
 some problem i can't solve.
>> =09I need your help!
>> 
>> =09I run iozone on nfs in kernel v2.4.21 and v2.6.11.12 ,the=
 test result is as follows:
>> =09v2.4.21:    write performance 106MB/s   (wsize,rsize=3D8192)
>> =09v2.6.11.12: write performance 52MB/s ;  (wsize,rsize=3D32768)
>> 
>> =09the iozone test command I use is : 
>> =09=09iozone -c -e -f /mnt/nfs/file1 -s 1g -r 2m -i 0 -w
>> 
>> =09My question is why the performance is lower when using v2.6?
>> 
>> =09The test platform is :
>> =09=09client: 1G memory,
>> =09=09server: 4G memory, 146G disk. 2cpu.
>> =09=09net: 1000Mb
>> 
>> =09When i use the following command to chechk why v2.6 takes=
 much more time, I found that the fsync operations takes much=
 more time. the command is:
>> =09strace -o result -T write, close, fsync ./iozone -c -e -f=
 /mnt/nfs/file1 -s 1g -r 2m -i 0 -w
>> =09the result of this command is that the time of write is=
 6(ms),while the time of sync before close is 6 (s).
>> 
>> =09So 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 removal of flushd while introducing =
 pdflush in client memory management ?
>> 
>> =09Thank you!  Waiting for your reply!
>> 
>> 
>> ------------------------------------------------------------
>> National Research Center for Intelligent Computing Systems
>> Insitute of Computing Technology
>> Chinese Academy of Sciences=A1=A1=A1=A1=A1=A1
>> ------------------------------------------------------------
>> =09=09
>> 
>> =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
>> 
>> 
>> 
>> 
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=3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D
=09=09=09

=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=D6=C2
=C0=F1=A3=A1
 
=09=09=09=09 
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=B3=C2=BB=B6
=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=A12005-12-15


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