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From: Larry McVoy <lm@bitmover.com>
To: "David S. Miller" <davem@redhat.com>
Cc: Larry McVoy <lm@bitmover.com>,
	roland@topspin.com, alan@storlinksemi.com,
	linux-kernel@vger.kernel.org, linux-net@vger.kernel.org,
	netdev@oss.sgi.com
Subject: Re: TCP IP Offloading Interface
Date: Sun, 13 Jul 2003 16:54:24 -0700	[thread overview]
Message-ID: <20030713235424.GB31793@work.bitmover.com> (raw)
In-Reply-To: <20030713164003.21839eb4.davem@redhat.com>

> The whole point is to not touch any of this data.
> 
> The idea is to push the pages directly into the page cache
> of the filesystem.

It doesn't work.  Measure the cost of the VM operations before you go
down this path.  Just set up a system call that swaps a page with a
kernel allocated buffer and then see how many of those you can do a 
second.  Maybe Linux is so blindingly fast this makes sense but IRIX
certainly wasn't, the VM overhead hurt like crazy.

Every time I tried to push the page flip idea or offloading or any of
that crap, Andy Bechtolsheim would tell "the CPUs will get faster faster
than you can make that work".  He was right.
-- 
---
Larry McVoy              lm at bitmover.com          http://www.bitmover.com/lm

  reply	other threads:[~2003-07-13 23:39 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-13  7:33 TCP IP Offloading Interface Alan Shih
2003-07-13  7:48 ` David S. Miller
2003-07-13 16:22   ` Roland Dreier
2003-07-13 16:31     ` Alan Cox
2003-07-13 16:49       ` Jeff Garzik
2003-07-13 16:58       ` Jeff Garzik
2003-07-13 23:02     ` David S. Miller
2003-07-13 23:35       ` Larry McVoy
2003-07-13 23:40         ` David S. Miller
2003-07-13 23:54           ` Larry McVoy [this message]
2003-07-13 23:53             ` David S. Miller
2003-07-14  0:22               ` Larry McVoy
2003-07-14  0:24                 ` David S. Miller
2003-07-14  0:48                   ` Larry McVoy
2003-07-14  0:46               ` Valdis.Kletnieks
2003-07-14  0:42                 ` David S. Miller
2003-07-16  2:46                   ` Matt Porter
2003-07-14  0:20       ` Roland Dreier
2003-07-14  0:28         ` David S. Miller
2003-07-16  2:37   ` Matt Porter
2003-07-13 14:51 ` Jeff Garzik
     [not found] <E3738FB497C72449B0A81AEABE6E713C027A43@STXCHG1.simpletech.com>
2003-07-15  5:51 ` David S. Miller
2003-07-16  5:02   ` jamal
2003-07-16  1:51     ` Roland Dreier
2003-07-15 16:28 David griego

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