From: "saeed bishara" <saeed.bishara@gmail.com>
To: "Jeff Garzik" <jeff@garzik.org>
Cc: linux-kernel@vger.kernel.org, "NFS list" <linux-nfs@vger.kernel.org>
Subject: Re: read-ahead in NFS server
Date: Thu, 27 Dec 2007 17:00:12 +0200 [thread overview]
Message-ID: <c70ff3ad0712270700h6336b194r7c21834423aeb331@mail.gmail.com> (raw)
In-Reply-To: <47739288.7000308@garzik.org>
> >> Are you using TCP? Are you using NFSv4, or an older version?
> > I'm using NFSv3/UDP.
>
> IMO, you definitely want TCP and NFSv4. Much better network behavior,
> with some of the silly UDP limits (plus greatly improved caching
> behavior, due to v4 delegations).
the clients of my system going to be embedded system with low
performance cpus and I need UDP as it needs less cpu power.
> > when I run local dd with bs=4K, I can see that the average IO size is
> > more than 300KB.
>
> Read-ahead is easier in NFSv4, because the client probably has the file
> delegated locally, and has far less need to constantly revalidate file
> mapping(s).
I'll check that.
but what about the server side? why the issued IO's are only as twice
as the size of the NFS requests?
next prev parent reply other threads:[~2007-12-27 15:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-26 11:51 saeed bishara
2007-12-27 2:34 ` Jeff Garzik
2007-12-27 8:50 ` saeed bishara
2007-12-27 11:54 ` Jeff Garzik
2007-12-27 15:00 ` saeed bishara [this message]
2007-12-27 15:07 ` Jeff Garzik
2007-12-27 15:38 ` saeed bishara
[not found] ` <E1J852H-0002K7-P1@localhost>
2007-12-28 2:33 ` Fengguang Wu
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