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Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)

To: Andrew Morton <andrewm@xxxxxxxxxx>
Subject: Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)
From: Chris Wedgwood <cw@xxxxxxxx>
Date: Wed, 31 Jan 2001 06:49:11 +1300
Cc: "David S. Miller" <davem@xxxxxxxxxx>, lkml <linux-kernel@xxxxxxxxxxxxxxx>, "netdev@xxxxxxxxxxx" <netdev@xxxxxxxxxxx>
In-reply-to: <3A76D6A4.2385185E@xxxxxxxxxx>; from andrewm@xxxxxxxxxx on Wed, Jan 31, 2001 at 01:58:44AM +1100
References: <3A76B72D.2DD3E640@xxxxxxxxxx>, <3A728475.34CF841@xxxxxxxxxx> <3A726087.764CC02E@xxxxxxxxxx> <20010126222003.A11994@xxxxxxxxxxx> <14966.22671.446439.838872@xxxxxxxxxxxxxxx> <3A76B72D.2DD3E640@xxxxxxxxxx> <14966.47384.971741.939842@xxxxxxxxxxxxxxx> <3A76D6A4.2385185E@xxxxxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
User-agent: Mutt/1.2.5i
On Wed, Jan 31, 2001 at 01:58:44AM +1100, Andrew Morton wrote:

    Mount the server rsize=wsize=8192.  `cp' a 102,400,000 byte file
    from the NFS server to /dev/null.  The file is fully cached on
    the server.  unmount and remount the server between runs to
    eliminate client caching. The copy takes 8.654 seconds.  That's
    11.8 megabytes/sec.

What server are you using here? Using NetApp filers I don't see
anything like this, probably only 8.5MB/s at most and this number is
fairly noisy.



  --cw

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