From: Andi Kleen <andi@firstfloor.org>
To: Chris Friesen <cfriesen@nortel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Renzo Davoli <renzo@cs.unibo.it>,
linux-kernel@vger.kernel.org
Subject: Re: New Address Family: Inter Process Networking (IPN)
Date: Thu, 6 Dec 2007 23:07:54 +0100 [thread overview]
Message-ID: <20071206220754.GF20595@one.firstfloor.org> (raw)
In-Reply-To: <47586E7F.1020903@nortel.com>
On Thu, Dec 06, 2007 at 03:49:51PM -0600, Chris Friesen wrote:
> Andi Kleen wrote:
> >>Latency was very
> >>important, so we ended up doing essentially a multicast unix socket
> >>rather than taking the extra penalty for UDP multicast.
> >
> >
> >What extra penalty? Local UDP shouldn't be much more expensive than Unix.
>
> On a 1.4GHz P4 I measured a 44% increase in latency between a unix
> datagram and a UDP datagram.
That's weird.
>
> For UDP it has to go down the udp stack, then the ip stack, then through
UDP doesn't really have much stack. IP is also very little assuming
cached route (connect called first)
I would expect the copies to dominate in both cases.
-Andi
next prev parent reply other threads:[~2007-12-06 22:08 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-05 16:40 New Address Family: Inter Process Networking (IPN) Renzo Davoli
2007-12-05 21:55 ` Stephen Hemminger
2007-12-06 5:38 ` Renzo Davoli
2007-12-06 5:43 ` Renzo Davoli
2007-12-06 6:04 ` Stephen Hemminger
2007-12-05 23:39 ` Andi Kleen
2007-12-06 5:30 ` Renzo Davoli
2007-12-06 6:19 ` Kyle Moffett
2007-12-06 6:59 ` David Newall
2007-12-06 16:34 ` Andi Kleen
2007-12-06 22:21 ` David Newall
2007-12-06 22:42 ` Andi Kleen
2007-12-06 16:35 ` Andi Kleen
2007-12-06 20:36 ` Chris Friesen
2007-12-06 21:26 ` Andi Kleen
2007-12-06 21:49 ` Chris Friesen
2007-12-06 22:07 ` Andi Kleen [this message]
2007-12-06 22:18 ` Renzo Davoli
2007-12-06 22:38 ` Andi Kleen
2007-12-07 0:18 ` Renzo Davoli
2007-12-06 23:02 ` Chris Friesen
2007-12-06 23:06 ` Andi Kleen
2007-12-06 23:42 ` Chris Friesen
2007-12-07 3:41 ` David Miller
2007-12-07 4:21 ` Chris Friesen
2007-12-07 4:54 ` Ben Pfaff
2007-12-07 6:40 ` David Miller
2007-12-07 10:03 ` Andi Kleen
2007-12-07 21:18 ` AF_IPN: Inter Process Networking, try these Renzo Davoli
2007-12-08 2:07 ` David Miller
2007-12-10 16:05 ` New Address Family: Inter Process Networking (IPN) Chris Friesen
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