From: "Lever, Charles" Subject: RE: NFS sync write performance Date: Tue, 24 Feb 2004 12:42:23 -0800 Sender: nfs-admin@lists.sourceforge.net Message-ID: <482A3FA0050D21419C269D13989C6113020ACC45@lavender-fe.eng.netapp.com> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C3FB16.B4A327FE" Cc: Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1AvjOt-0002S6-EQ for nfs@lists.sourceforge.net; Tue, 24 Feb 2004 12:43:31 -0800 Received: from mx01.netapp.com ([198.95.226.53]) by sc8-sf-mx2.sourceforge.net with esmtp (Exim 4.30) id 1AvjBe-0007OK-UO for nfs@lists.sourceforge.net; Tue, 24 Feb 2004 12:29:50 -0800 To: "Alex Wun" Errors-To: nfs-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Post: List-Help: List-Subscribe: , List-Archive: This is a multi-part message in MIME format. ------_=_NextPart_001_01C3FB16.B4A327FE Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable hi alex- =20 sync writes are slow, that should be expected. the Linux NFS client writes a page at a time, for architectural reasons, but could be = improved if we could get it to write a whole "wsize" chunk at a time. =20 -----Original Message----- From: Alex Wun [mailto:alexwun@consensys.com] Sent: Tuesday, February 24, 2004 9:07 AM To: nfs@lists.sourceforge.net Subject: [NFS] NFS sync write performance Hi. =20 I'm interested in the knowing what kind of performance numbers people = are getting with NFSv3 synchronous writes. (i.e. what should I be expecting?) =20 My system: =20 RedHat9.0 linux-2.4.20 Dual Intel Xeon P3 1.1Ghz 1GB ram 7-disk Raid5 XFS Filesystem IntelPRO1000 GigE =20 Sequential local writes (rewrites) to a 2GB file on the Raid5 go at over = 100MB/s. But over NFS (v3, sync) it's less than 10MB/s. Is this roughly what's = expected or is something wrong with my setup? =20 As a side note, after modifying some code in the nfs client, nfs server, = and xfs filesystem, I was able to get performance up to ~45MB/s on the 7-disk Raid5 and ~60MB/s on a = 7-disk Raid0. These customizations are still very primitive but they might be worth looking into. I know = the nfs developers are busy, but would they be interested in providing some feedback? =20 Thanks, Alex Wun alexwun@consensys.com =20 Consensys Computers Inc. ------_=_NextPart_001_01C3FB16.B4A327FE Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
hi=20 alex-
 
sync=20 writes are slow, that should be expected.  the Linux NFS=20 client
writes=20 a page at a time, for architectural reasons, but could be=20 improved
if we=20 could get it to write a whole "wsize" chunk at a = time.
 
-----Original Message-----
From: Alex Wun=20 [mailto:alexwun@consensys.com]
Sent: Tuesday, February 24, = 2004 9:07=20 AM
To: nfs@lists.sourceforge.net
Subject: [NFS] = NFS sync=20 write performance

Hi.
 
I'm interested in the knowing what kind of=20 performance numbers people are getting with NFSv3 synchronous=20 writes.
(i.e. what should I be = expecting?)
 
My system:
 
RedHat9.0 linux-2.4.20
Dual Intel Xeon P3 1.1Ghz
1GB ram
7-disk Raid5
XFS Filesystem
IntelPRO1000 GigE
 
Sequential local writes (rewrites) to a 2GB = file on=20 the Raid5 go at over 100MB/s.  But
over NFS (v3, sync) it's less than 10MB/s. = Is this=20 roughly what's expected or is something
wrong with my setup?
 
As a side note, after modifying some = code in the=20 nfs client, nfs server, and xfs filesystem, I was able to
get performance up to ~45MB/s on the = 7-disk=20 Raid5 and ~60MB/s on a 7-disk Raid0.  These=20 customizations
are still very primitive but they = might be worth=20 looking into.  I know the nfs developers are busy, but = would
they be interested in providing some=20 feedback?
 
Thanks,
Alex Wun
alexwun@consensys.com<= /FONT>
Consensys Computers=20 Inc.
------_=_NextPart_001_01C3FB16.B4A327FE-- ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs