From: Karsten Desler <kdesler@soohrt.org>
To: Robert Olsson <Robert.Olsson@data.slu.se>
Cc: P@draigBrady.com, "David S. Miller" <davem@davemloft.net>,
netdev@oss.sgi.com, linux-kernel@vger.kernel.org
Subject: Re: _High_ CPU usage while routing (mostly) small UDP packets
Date: Tue, 7 Dec 2004 13:50:01 +0100 [thread overview]
Message-ID: <20041207125001.GA26644@soohrt.org> (raw)
In-Reply-To: <16821.42080.932184.167780@robur.slu.se>
* Robert Olsson wrote:
> Well my experience is that it very hard not to say almost impossible to
> extrapolate idle cpu into any network system capacity. I guess this is
> what you are trying to do?
Kinda, yes.
I'm trying to evaluate if the behaviour I'm seeing is expected, which
would heavily influence my choice of hardware/software for future
projects (and of course to optimize the current setup).
Currently I'm having problems capturing packets with tcpdump (lots of
"packets dropped by kernel") which indicates to me that there's
genuinely not much (enough) idle time sitting around.
> Rather load and overload the system with traffic having the characteristics
> you expect as a bonus you will get some kind proof of robustness and
> responsiveness a max load. There are tools for this type of tests.
Will do, that could take a couple of days though.
Cheers,
Karsten
next prev parent reply other threads:[~2004-12-07 12:50 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-06 20:53 _High_ CPU usage while routing (mostly) small UDP packets Karsten Desler
2004-12-06 21:48 ` David S. Miller
2004-12-06 22:41 ` Karsten Desler
2004-12-06 23:56 ` Con Kolivas
2004-12-07 0:18 ` Karsten Desler
[not found] ` <E1CbSf8-00047p-00@calista.eckenfels.6bone.ka-ip.net>
2004-12-07 0:20 ` Karsten Desler
2004-12-07 2:46 ` jamal
2004-12-07 2:54 ` Karsten Desler
2004-12-07 3:18 ` jamal
2004-12-07 3:24 ` Karsten Desler
2004-12-07 3:30 ` jamal
2004-12-07 4:02 ` Karsten Desler
2004-12-07 10:21 ` Karsten Desler
2004-12-07 12:34 ` jamal
2004-12-07 13:14 ` Karsten Desler
2004-12-07 10:47 ` P
2004-12-07 11:21 ` Karsten Desler
2004-12-07 12:38 ` Robert Olsson
2004-12-07 12:50 ` Karsten Desler [this message]
2004-12-07 13:04 ` jamal
2004-12-07 13:11 ` Karsten Desler
2004-12-07 13:39 ` P
2004-12-07 18:38 ` Karsten Desler
2004-12-08 5:39 ` Willy Tarreau
2004-12-08 13:08 ` Karsten Desler
2004-12-08 13:27 ` jamal
2004-12-07 21:10 ` Karsten Desler
2004-12-07 22:40 ` Robert Olsson
2004-12-08 22:06 ` Karsten Desler
2004-12-08 4:31 ` jamal
2004-12-08 13:26 ` Karsten Desler
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