From: Lee Revell <rlrevell@joe-job.com>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Xin Zhao <uszhaoxin@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: NFS2 question, help, pls!
Date: Tue, 12 Apr 2005 19:10:21 -0400 [thread overview]
Message-ID: <1113347421.13102.6.camel@mindpipe> (raw)
In-Reply-To: <1113344795.10420.125.camel@lade.trondhjem.org>
On Tue, 2005-04-12 at 15:26 -0700, Trond Myklebust wrote:
> ty den 12.04.2005 Klokka 15:22 (-0400) skreiv Xin Zhao:
> > I have very very fast network and is testing NFS2 over this kind of
> > network. I noticed that for standard work like read/write a large
> > file, compile kernels, the performance of NFS2 is good. But if I try
> > to decompress kernel tar file. The standard ext2 takes 28s while NFS2
> > takes 81s. Also, if I remove the kernel source code tree, ext2 takes
> > 19s but NFS2 takes 44s.
> >
> > Why? (You can assume that network is very fast. ) Is there any
> > improvements in NFS3/4 on this issue? If so, how?
>
> NFSv2 requires the server to immediately write all data to disk before
> it can reply to the RPC write request (synchronous writes).
This behavior can be disabled with the "async" export option for NFSv2.
Lee
prev parent reply other threads:[~2005-04-12 23:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-12 19:22 NFS2 question, help, pls! Xin Zhao
2005-04-12 22:26 ` Trond Myklebust
2005-04-12 23:10 ` Lee Revell [this message]
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