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Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1

To: "Stephen C. Tweedie" <sct@xxxxxxxxxx>
Subject: Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1
From: Ingo Molnar <mingo@xxxxxxx>
Date: Tue, 9 Jan 2001 16:37:26 +0100 (CET)
Cc: Rik van Riel <riel@xxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxx>, <hch@xxxxxxxxxx>, <netdev@xxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <20010109151725.D9321@redhat.com>
Reply-to: <mingo@xxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
On Tue, 9 Jan 2001, Stephen C. Tweedie wrote:

> Jes has also got hard numbers for the performance advantages of
> jumbograms on some of the networks he's been using, and you ain't
> going to get udp jumbograms through a page-by-page API, ever.

i know the performance advantages of jumbograms (typically when it's over
a local network), it's undisputed. Still i dont see why it should be
impossible to do effective UDP via a single-page interface. Eg. buffering
of outgoing pages could be supported, and MSG_MORE in sendmsg() used to
indicate end of stream. This is why ->writepage() has a 'more' flag (and
tcp_sendpage() has a flag as well).

        Ingo


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