From: Andi Kleen <ak@muc.de>
To: Greg Banks <gnb@sgi.com>
Cc: Arthur Kepner <akepner@sgi.com>,
"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
netdev@oss.sgi.com, davem@redhat.com
Subject: Re: NAPI, e100, and system performance problem
Date: Fri, 22 Apr 2005 13:36:56 +0200 [thread overview]
Message-ID: <m1hdhzyrdz.fsf@muc.de> (raw)
In-Reply-To: <20050419055535.GA12211@sgi.com> (Greg Banks's message of "Tue, 19 Apr 2005 15:55:35 +1000")
Greg Banks <gnb@sgi.com> writes:
>
> An inordinate amount of CPU is being spent running around polling the
> device instead of dealing with the packets in IP, TCP and NFS land.
> By inordinate, we mean twice as much or more cpu% than a MIPS/Irix
> box with slower CPUs.
We have seen similar behaviour. With NAPI some benchmarks run
a lot slower than on a driver on the same hardware/NIC without NAPI.
This can be even observed with simple tests like netperf single stream
between two boxes.
There seems to be also some problems with bidirectional traffic, although
I have not fully tracked them down to NAPI yet.
There is definitely some problem in NAPI land ...
-Andi
next prev parent reply other threads:[~2005-04-22 11:36 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 [this message]
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
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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