netdev - Re: [PATCH net-next 2/2] net: exit busy loop when another process is runnable

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Message-ID: <20160414005522.GA2975@worktop.cust.blueprintrf.com>
Date:	Thu, 14 Apr 2016 02:55:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Wang <jasowang@...hat.com>
Cc:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	mst@...hat.com,
	"Ingo Molnar jacob.e.keller@...el.com" <mingo@...e.hu>
Subject: Re: [PATCH net-next 2/2] net: exit busy loop when another process is
 runnable

On Tue, Sep 02, 2014 at 02:31:53PM +0800, Jason Wang wrote:
> Yes, but current code can not do this. In most of the cases, the new
> woke up process have no chance to run if another process is busy loop in
> the same cpu.

That sounds weird; a process that slept will have an effective vruntime
deficit vs one that has been running for a while.