From: jamal <hadi@cyberus.ca>
To: "David S. Miller" <davem@davemloft.net>
Cc: Stephen Hemminger <shemminger@osdl.org>,
gnb@sgi.com, ak@muc.de, akepner@sgi.com,
jesse.brandeburg@intel.com, netdev@oss.sgi.com, davem@redhat.com
Subject: Re: NAPI, e100, and system performance problem
Date: Fri, 22 Apr 2005 23:04:25 -0400 [thread overview]
Message-ID: <1114225465.7669.27.camel@localhost.localdomain> (raw)
In-Reply-To: <20050422164301.724343f6.davem@davemloft.net>
On Fri, 2005-22-04 at 16:43 -0700, David S. Miller wrote:
> With the dynamic schemes comes a new issue, how quickly to respond
> to changes in traffic patterns.
Unfortunately, dynamic adjustment of mitigation parameters - in my
experiments at least (pre-NAPI) - show stability is hard to achieve.
In fact the early tulip driver had about 8 levels of mitigation (that i
put in and later taken out by Robert due to the instability).
The one thing that has been tossed around is to modify the state machine
such that the netdev is not taken out of the poll list for at least one
more poll round or a timeout period. I did try this a while back and the
extra poll did consume extra CPU - it probably isnt as bad as done by
extra PIO(s);
I still think static mitigation + NAPI should do it.
cheers,
jamal
next prev parent reply other threads:[~2005-04-23 3:04 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-18 6:11 NAPI, e100, and system performance problem Brandeburg, Jesse
2005-04-18 12:14 ` jamal
2005-04-18 15:36 ` Robert Olsson
2005-04-18 16:55 ` Arthur Kepner
2005-04-18 19:34 ` Robert Olsson
2005-04-18 20:26 ` jamal
2005-04-19 5:55 ` Greg Banks
2005-04-19 18:36 ` David S. Miller
2005-04-19 20:38 ` NAPI and CPU utilization [was: NAPI, e100, and system performance problem] Arthur Kepner
2005-04-19 20:52 ` Rick Jones
2005-04-19 21:09 ` David S. Miller
[not found] ` <20050420145629.GH19415@sgi.com>
2005-04-20 15:15 ` NAPI, e100, and system performance problem jamal
2005-04-22 11:36 ` Andi Kleen
2005-04-22 12:33 ` jamal
2005-04-22 17:21 ` Andi Kleen
2005-04-22 18:18 ` jamal
2005-04-22 18:30 ` Andi Kleen
2005-04-22 18:37 ` Arthur Kepner
2005-04-22 18:52 ` David S. Miller
[not found] ` <Pine.LNX.4.61.0504241845070.2934@linux.site>
2005-04-25 11:25 ` jamal
2005-04-25 18:51 ` David S. Miller
2005-04-25 11:41 ` jamal
2005-04-25 12:16 ` Jamal Hadi Salim
2005-04-22 19:01 ` jamal
2005-04-22 19:07 ` David S. Miller
2005-04-22 19:21 ` jamal
2005-04-23 20:50 ` Robert Olsson
2005-04-23 16:56 ` Robert Olsson
2005-04-22 23:28 ` Greg Banks
2005-04-22 23:40 ` Stephen Hemminger
2005-04-22 23:43 ` David S. Miller
2005-04-23 2:51 ` Stephen Hemminger
2005-04-23 17:54 ` Robert Olsson
2005-04-23 3:04 ` jamal [this message]
2005-04-23 17:14 ` Robert Olsson
2005-04-22 14:52 ` Robert Olsson
2005-04-22 15:37 ` jamal
2005-04-22 17:22 ` Andi Kleen
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