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From: "David S. Miller" <davem@redhat.com>
To: Larry McVoy <lm@bitmover.com>
Cc: 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 17:24:14 -0700	[thread overview]
Message-ID: <20030713172414.5c888094.davem@redhat.com> (raw)
In-Reply-To: <20030714002200.GA24697@work.bitmover.com>

On Sun, 13 Jul 2003 17:22:00 -0700
Larry McVoy <lm@bitmover.com> wrote:

> Hey, maybe it isn't, but could you please quantify the cost of the VM 
> operations?  How hard is that?

Ok.

So the page is in a non-uptodate state, NFS would have it locked,
and anyone else trying to get at it would sleep.

This page we have currently is "dummy" in that it is only a place
holder in case we don't get a full page from the networking.

We have all the infrastructure to do everything up to this point.

Next, if the networking gave us a full page, we'd "replace"
the dummy page with this one, which would involve:

1) delete the dummy page from the lookup, insert the networking's
   page

2) arrange so that all sleepers on the dummy page will do a relookup
   and find the new page

And when we're done with the operation we wake everyone up.

I can't see any part of this turning out to be expensive.

  reply	other threads:[~2003-07-14  0:18 UTC|newest]

Thread overview: 28+ 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
2003-07-13 23:53             ` David S. Miller
2003-07-14  0:22               ` Larry McVoy
2003-07-14  0:24                 ` David S. Miller [this message]
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
2003-07-15  5:42 Jordi Ros
2003-07-15  5:51 ` David S. Miller
2003-07-16  5:02   ` jamal
2003-07-16  1:51     ` Roland Dreier
2003-07-15 19:01 ` Ralph Doncaster
2003-07-15 19:36   ` Chris Dukes
2003-07-15 16:28 David griego

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