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

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Message-ID: <20070403085132.GA15344@elte.hu>
Date:	Tue, 3 Apr 2007 10:51:32 +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:

> > there are a few other things i'm working on to improve this. I've 
> > uploaded -rt9 which is the current state of affairs. Note that using 
> > -rt9 you'll likely only see IRQ-8406 overhead in the system, because 
> > i've added an optimization to do process the softirq-net-tx workload 
> > in the hardirq thread if the priority of the two is the same (which 
> > is the default behavior). But -rt9 is still work in progress that is 
> > not fully finished yet: in some cases i'm seeing 'fluctuating 
> > performance' problems on forcedeth that werent there before.
> 
> I tried -rt9 and saw some odd 'fluctuating performance'. I'll try it 
> again tomorrow when I am much closer to the box's power button.

could you try -rt10? I've improved hardirq/softirq threading performance 
some more, and have tuned the forcedeth driver too.

	Ingo
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