linux-kernel - Re: [RFC PATCH 0/2] net: threadable napi poll loop

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Message-ID: <1462917753.16365.15.camel@redhat.com>
Date:	Tue, 10 May 2016 18:02:33 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jiri@...lanox.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Alexander Duyck <aduyck@...antis.com>,
	Tom Herbert <tom@...bertland.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/2] net: threadable napi poll loop

On Tue, 2016-05-10 at 14:53 -0700, Eric Dumazet wrote:
> On Tue, 2016-05-10 at 17:35 -0400, Rik van Riel wrote:
> 
> > 
> > You might need another one of these in invoke_softirq()
> > 
> Excellent.
> 
> I gave it a quick try (without your suggestion), and host seems to
> survive a stress test.
> 
> Of course we do have to fix these problems :
> 
> [  147.781629] NOHZ: local_softirq_pending 48
> [  147.785546] NOHZ: local_softirq_pending 48
> [  147.788344] NOHZ: local_softirq_pending 48
> [  147.788992] NOHZ: local_softirq_pending 48
> [  147.790943] NOHZ: local_softirq_pending 48
> [  147.791232] NOHZ: local_softirq_pending 24a
> [  147.791258] NOHZ: local_softirq_pending 48
> [  147.791366] NOHZ: local_softirq_pending 48
> [  147.792118] NOHZ: local_softirq_pending 48
> [  147.793428] NOHZ: local_softirq_pending 48

As long as ksoftirqd is running, that should not be
an actual problem, just a false positive.

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