linux-kernel - Re: questions on NAPI processing latency and dropped network packets

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Message-ID: <47868E28.1070600@nortel.com>
Date:	Thu, 10 Jan 2008 15:29:12 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	James Chapman <jchapman@...alix.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: questions on NAPI processing latency and dropped network packets

James Chapman wrote:

> What's changed in your application? Any real-time threads in there?
> 
>>>From the top output below, looks like SigtranServices is consuming all
> your CPU...

There are two cpus, and SigtranServices is multithreaded with many 
threads.  Most of these threads are affined to cpu0, a couple to cpu1. 
None of the threads are realtime.

Top is showing 37% idle on cpu0, and 6% idle on cpu1, so not all the cpu 
is being consumed.  However, I'm wondering if we're hitting bursty bits 
and we're just running out of time.

I'm going to try a system with MAX_SOFTIRQ_RESTART bumped up a bit, and 
also enable profiling.

Chris
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