From: Greg Banks <gnb@melbourne.sgi.com>
To: Jakob Oestergaard <jakob@unthought.net>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: bdflush/rpciod high CPU utilization, profile does not make sense
Date: Tue, 12 Apr 2005 11:03:29 +1000 [thread overview]
Message-ID: <1113267809.1956.242.camel@hole.melbourne.sgi.com> (raw)
In-Reply-To: <20050411154211.GG13369@unthought.net>
On Tue, 2005-04-12 at 01:42, Jakob Oestergaard wrote:
> Yes, as far as I know - the Broadcom Tigeon3 driver does not have the
> option of enabling/disabling RX polling (if we agree that is what we're
> talking about), but looking in tg3.c it seems that it *always*
> unconditionally uses NAPI...
I've whined and moaned about this in the past, but for all its
faults NAPI on tg3 doesn't lose packets. It does cause a huge
increase in irq cpu time on multiple fast CPUs. What irq rate
are you seeing?
I did once post a patch to make NAPI for tg3 selectable at
configure time.
http://marc.theaimsgroup.com/?l=linux-netdev&m=107183822710263&w=2
> No dropped packets... I wonder if the tg3 driver is being completely
> honest about this...
At one point it wasn't, since this patch it is:
http://marc.theaimsgroup.com/?l=linux-netdev&m=108433829603319&w=2
Greg.
--
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.
next prev parent reply other threads:[~2005-04-12 1:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-06 16:01 Jakob Oestergaard
2005-04-06 21:28 ` Trond Myklebust
2005-04-07 15:28 ` Jakob Oestergaard
2005-04-06 23:19 ` Greg Banks
2005-04-07 15:38 ` Jakob Oestergaard
2005-04-07 16:01 ` Greg Banks
2005-04-07 16:17 ` Trond Myklebust
2005-04-09 21:35 ` Jakob Oestergaard
2005-04-09 21:52 ` Trond Myklebust
2005-04-11 7:48 ` Jakob Oestergaard
2005-04-11 12:35 ` Trond Myklebust
2005-04-11 13:47 ` Jakob Oestergaard
2005-04-11 14:35 ` Trond Myklebust
2005-04-11 14:41 ` Jakob Oestergaard
2005-04-11 15:21 ` Trond Myklebust
2005-04-11 15:42 ` Jakob Oestergaard
2005-04-12 1:03 ` Greg Banks [this message]
2005-04-12 9:28 ` Jakob Oestergaard
2005-04-19 19:45 ` Jakob Oestergaard
2005-04-19 22:46 ` Trond Myklebust
2005-04-20 13:57 ` Jakob Oestergaard
2005-04-24 7:15 ` Jakob Oestergaard
2005-04-25 3:09 ` Trond Myklebust
2005-04-25 13:50 ` Jakob Oestergaard
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