linux-kernel - Re: balance storm

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Message-ID: <1401185133.5134.119.camel@marge.simpson.net>
Date:	Tue, 27 May 2014 12:05:33 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Libo Chen <libo.chen@...wei.com>, tglx@...utronix.de,
	mingo@...e.hu, LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Li Zefan <lizefan@...wei.com>
Subject: Re: balance storm

On Tue, 2014-05-27 at 11:48 +0200, Peter Zijlstra wrote:

> So I suppose this is due to the select_idle_sibling() nonsense again,
> where we assumes L3 is a fair compromise between cheap enough and
> effective enough.

Nodz.

> Of course, Intel keeps growing the cpu count covered by L3 to ridiculous
> sizes, 8 cores isn't nowhere near their top silly, which shifts the
> balance, and there's always going to be pathological cases (like the
> proposed workload) where its just always going to suck eggs.

Test is as pathological as it gets.  15 core + SMT wouldn't be pretty.

-Mike

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