From: Ingo Molnar <mingo@elte.hu>
To: Jeff Garzik <jeff@garzik.org>
Cc: David Miller <davem@davemloft.net>,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
shemminger@linux-foundation.org
Subject: Re: [patch] forcedeth: fix the NAPI poll function
Date: Tue, 16 Oct 2007 09:49:43 +0200 [thread overview]
Message-ID: <20071016074943.GA24481@elte.hu> (raw)
In-Reply-To: <47146593.2060909@garzik.org>
* Jeff Garzik <jeff@garzik.org> wrote:
> >FYI, looks good so far, ontop of Linus' latest -git tree.
> >
> >btw., one thing i always found weird about forcedeth is that it
> >generates an extra ~100 irqs per second even when there's no network
> >traffic:
> >
> > 11: 89752 XT-PIC-XT eth0
> > 11: 89854 XT-PIC-XT eth0
> > 11: 89955 XT-PIC-XT eth0
> > 11: 90056 XT-PIC-XT eth0
> > 11: 90157 XT-PIC-XT eth0
> >
> >(irq count snapshot every second). Just in case it's easy to fix ...
>
>
> May I presume that behavior occurs in both mainline and my fe-lock
> branch?
correct.
> That is likely the NIC's timer irq, which is programmed to kick the
> irq handler every so often. DEV_NEED_TIMERIRQ is a starting point, as
> well as "Known bugs" at the top of forcedeth.c, if you're curious.
>
> I'm _betting_ that some of that can be eliminated, but we'll see...
ok. Was just a FYI - you were looking for feedback :-)
Ingo
next prev parent reply other threads:[~2007-10-16 7:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-15 11:24 WARNING: at net/core/dev.c:2161 net_rx_action() Ingo Molnar
2007-10-15 11:27 ` Ingo Molnar
2007-10-15 16:18 ` Ingo Molnar
2007-10-15 19:57 ` David Miller
2007-10-15 22:03 ` Ingo Molnar
2007-10-15 22:07 ` Ingo Molnar
2007-10-15 22:21 ` David Miller
2007-10-15 22:30 ` [patch] forcedeth: fix the NAPI poll function Ingo Molnar
2007-10-15 22:39 ` David Miller
2007-10-15 22:40 ` Jeff Garzik
2007-10-15 22:41 ` Jeff Garzik
2007-10-16 5:42 ` Ingo Molnar
2007-10-16 5:47 ` Jeff Garzik
2007-10-16 6:40 ` Ingo Molnar
2007-10-16 7:17 ` Jeff Garzik
2007-10-16 7:49 ` Ingo Molnar [this message]
2007-10-16 16:52 ` Jeff Garzik
2007-10-16 21:20 ` Jeff Garzik
2007-10-17 7:25 ` Ingo Molnar
2007-10-17 10:18 ` [patch] forcedeth: fix the NAPI poll function, take #2 Ingo Molnar
2007-10-18 0:21 ` Jeff Garzik
2007-10-15 22:18 ` WARNING: at net/core/dev.c:2161 net_rx_action() David Miller
2007-10-15 22:20 ` Jeff Garzik
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