linux-kernel - Re: sched: Avoid SMT siblings in select_idle

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Message-ID: <20120221083241.GC5156@linux.vnet.ibm.com>
Date:	Tue, 21 Feb 2012 14:02:41 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

* Mike Galbraith <efault@....de> [2012-02-21 06:43:18]:

> On Mon, 2012-02-20 at 20:07 +0100, Peter Zijlstra wrote: 
> > On Mon, 2012-02-20 at 19:14 +0100, Mike Galbraith wrote:
> > > Enabling SD_BALANCE_WAKE used to be decidedly too expensive to consider.
> > > Maybe that has changed, but I doubt it.
> > 
> > Right, I through I remembered some such, you could see it on wakeup
> > heavy things like pipe-bench and that java msg passing thing, right?
> 
> Yeah, it beat up switch heavy buddies pretty bad.

Do you have pointer to the java benchmark? Also is pipe-bench the same
as the one described below?

http://freecode.com/projects/pipebench

- vatsa

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