linux-kernel - Re: [PATCH] use unfair spinlock when running on hypervisor.

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Message-ID: <10707.1275413954@localhost>
Date:	Tue, 01 Jun 2010 13:39:14 -0400
From:	Valdis.Kletnieks@...edu
To:	Avi Kivity <avi@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Gleb Natapov <gleb@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, hpa@...or.com,
	mingo@...e.hu, npiggin@...e.de, tglx@...utronix.de,
	mtosatti@...hat.com
Subject: Re: [PATCH] use unfair spinlock when running on hypervisor.

On Tue, 01 Jun 2010 19:52:28 +0300, Avi Kivity said:
> On 06/01/2010 07:38 PM, Andi Kleen wrote:
> >>> Your new code would starve again, right?
> > Try it on a NUMA system with unfair memory.

> We are running everything on NUMA (since all modern machines are now 
> NUMA).  At what scale do the issues become observable?

My 6-month-old laptop is NUMA? Comes as a surprise to me, and to the
perfectly-running NUMA=n kernel I'm running.

Or did you mean a less broad phrase than "all modern machines"?


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