From: Raphael Jacquot <raphael.jacquot@imag.fr>
To: Xin Zhao <uszhaoxin@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Why is NFS write so slow?
Date: Mon, 21 Mar 2005 11:46:41 +0100 [thread overview]
Message-ID: <423EA611.3030409@imag.fr> (raw)
In-Reply-To: <4ae3c1405032100293ff52077@mail.gmail.com>
Xin Zhao wrote:
> Sorry for the dumb question.
>
> I am trying to develop a new filesystem based on NFS, which runs in a
> very fast network environment. I used the source code of NFS2, but
> noticed that NFS write is very slow. Even if I changed wsize to 8192,
> it still can only reach 1MB/s. I don't know why. Because the network
> is extremely fast (over 100MB/s), I don't think network is the only
> reason. Any other reason?
>
> Is the NFS write synchronous? Does that means the NFS server will not
> return before the data is flushed to disk? Because nfsd_write will
> close the file every time, I will assume that the data will be flushed
> to disk before return. However, even if I change nfsd_write to stop
> closing file, the write speed is still very slow. Can someone give me
> some advice about this?
>
> Thanks in advance!
because NFS is now at version 4, so you're 2 versions late ?
prev parent reply other threads:[~2005-03-21 10:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-21 8:29 Why is NFS write so slow? Xin Zhao
2005-03-21 10:15 ` Matthias Andree
2005-03-21 10:46 ` Raphael Jacquot [this message]
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