linux-kernel - Re: Poor UDP performance using 2.6.21-rc5-rt5

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Message-ID: <20070403064304.GA17938@elte.hu>
Date:	Tue, 3 Apr 2007 08:43:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Sperry <dave_sperry@...e.org>
Cc:	"'dave_sperry@...e.org'" <dasperry@...cast.net>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Poor UDP performance using 2.6.21-rc5-rt5


* David Sperry <dave_sperry@...e.org> wrote:

> > > I think there is some kind of bad behavior happening in the Nvidia 
> > > driver with respect to softirq-net-tx and IRQ-8406.
> > 
> > yes. Part of the problem is that the forcedeth.c driver does not 
> > fully support NAPI - today i've implemented those bits (see them 
> > below), based on your testcase. The other part is that the Intel NIC 
> > uses MSI, while foredeth uses fasteoi, correct? [you can see this in 
> > /proc/interrupts]
> 
> In my case forcedeth seems to be picking up MSI for eth2 & eth3

> Could this be part of my problem?

i dont think it should be a problem.

	Ingo
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