From: Rick Jones <rick.jones2@hp.com>
To: David Miller <davem@davemloft.net>
Cc: kuznet@ms2.inr.ac.ru, johnpol@2ka.mipt.ru, netdev@vger.kernel.org
Subject: Re: Netchannles: first stage has been completed. Further ideas.
Date: Fri, 21 Jul 2006 09:26:42 -0700 [thread overview]
Message-ID: <44C10042.1020503@hp.com> (raw)
In-Reply-To: <20060720.215504.41641534.davem@davemloft.net>
> All this talk reminds me of one thing, how expensive tcp_ack() is.
> And this expense has nothing to do with TCP really. The main cost is
> purging and freeing up the skbs which have been ACK'd in the
> retransmit queue.
>
> So tcp_ack() sort of inherits the cost of freeing a bunch of SKBs
> which haven't been touched by the cpu in some time and are thus nearly
> guarenteed to be cold in the cache.
>
> This is the kind of work we could think about batching to user
> sleeping on some socket call.
Ultimately isn't that just trying to squeeze the balloon?
rick jones
nice to see people seeing ACKs as expensive though :)
next prev parent reply other threads:[~2006-07-21 16:26 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-18 8:16 Netchannles: first stage has been completed. Further ideas Evgeniy Polyakov
2006-07-18 8:34 ` David Miller
2006-07-18 8:50 ` Evgeniy Polyakov
2006-07-18 11:16 ` Christian Borntraeger
2006-07-18 11:51 ` Evgeniy Polyakov
2006-07-18 12:36 ` Christian Borntraeger
2006-07-18 19:11 ` Evgeniy Polyakov
2006-07-18 21:20 ` David Miller
2006-07-18 12:15 ` Jörn Engel
2006-07-18 19:08 ` Evgeniy Polyakov
2006-07-19 11:00 ` Jörn Engel
2006-07-20 7:42 ` Evgeniy Polyakov
2006-07-18 23:01 ` Alexey Kuznetsov
2006-07-19 0:39 ` David Miller
2006-07-19 5:38 ` Evgeniy Polyakov
2006-07-19 6:30 ` Evgeniy Polyakov
2006-07-19 13:19 ` Alexey Kuznetsov
2006-07-20 7:32 ` Evgeniy Polyakov
2006-07-20 16:41 ` Alexey Kuznetsov
2006-07-20 21:08 ` Evgeniy Polyakov
2006-07-20 21:21 ` Ben Greear
2006-07-21 7:19 ` Evgeniy Polyakov
2006-07-21 7:20 ` Evgeniy Polyakov
2006-07-21 16:14 ` Ben Greear
2006-07-21 16:27 ` Evgeniy Polyakov
2006-07-22 13:23 ` Caitlin Bestler
2006-07-20 21:40 ` Ian McDonald
2006-07-21 7:26 ` Evgeniy Polyakov
2006-07-20 22:59 ` Alexey Kuznetsov
2006-07-21 4:55 ` David Miller
2006-07-21 7:10 ` Evgeniy Polyakov
2006-07-21 7:47 ` David Miller
2006-07-21 9:06 ` Evgeniy Polyakov
2006-07-21 9:19 ` David Miller
2006-07-21 9:39 ` Evgeniy Polyakov
2006-07-21 9:46 ` David Miller
2006-07-21 9:55 ` Evgeniy Polyakov
2006-07-21 16:26 ` Rick Jones [this message]
2006-07-21 20:57 ` David Miller
2006-07-19 19:52 ` Stephen Hemminger
2006-07-19 20:01 ` David Miller
2006-07-19 20:16 ` Stephen Hemminger
2006-07-24 18:54 ` Stephen Hemminger
2006-07-24 20:52 ` Alexey Kuznetsov
2006-07-27 2:17 ` Rusty Russell
2006-07-27 5:17 ` David Miller
2006-07-27 5:46 ` Rusty Russell
2006-07-27 6:00 ` David Miller
2006-07-27 18:54 ` Stephen Hemminger
2006-07-28 8:21 ` David Miller
2006-07-28 5:54 ` Rusty Russell
2006-08-01 4:47 ` David Miller
2006-08-01 6:36 ` Rusty Russell
2006-07-27 16:33 ` Alexey Kuznetsov
2006-07-27 16:51 ` Evgeniy Polyakov
2006-07-27 20:56 ` Alexey Kuznetsov
2006-07-28 5:17 ` Evgeniy Polyakov
2006-07-28 5:34 ` David Miller
2006-07-28 5:47 ` Evgeniy Polyakov
2006-07-28 4:49 ` Rusty Russell
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