linux-kernel - Re: NOHZ: local_softirq

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Message-ID: <20120601225754.GA25281@electric-eye.fr.zoreil.com>
Date:	Sat, 2 Jun 2012 00:57:54 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: NOHZ: local_softirq_pending 08

Thomas Gleixner <tglx@...utronix.de> :
[
> So it goes idle with NET_RX softirq pending. That really should not
> happen. I fear you need to fire up the tracer :)

Can you elaborate what "should not happen" mean ? AFAIU nothing prevents
softirq to be interrupted after NET_RX processing and thus NET_RX_SOFTIRQ
to be pending again before tick_nohz_irq_exit() runs.

Dave can you:
- specify if there much traffic when the message appears
- send /proc/interrupts + ethtool -S ethX

Thanks.

-- 
Ueimor
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