linux-kernel - Re: Serious problem with ticket spinlocks on ia64

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Date:	Thu, 2 Sep 2010 01:26:41 +0100
From:	Hedi Berriche <hedi@....com>
To:	Tony Luck <tony.luck@...el.com>
Cc:	Petr Tesarik <ptesarik@...e.cz>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Serious problem with ticket spinlocks on ia64

On Thu, Sep 02, 2010 at 00:10 Tony Luck wrote:
| More results from other experiments ...
| 
| 1) It occurred to me that I should check that these test cases weren't
| hitting some other problem in 2.6.36-rc3. So I ported the 64-bit
| version of ticket locks to the current kernel and ran the stress test.
| It was still going strong at 16 hours (where all my other experiments
| tend to fail at 90 minutes or less).

This is consistent with the bisection that led me to the 4 bytes ticket
locks commit.

| Summary: the only change that helps is the 64-bit ticket locks.

Ditto.

Cheers,
Hedi.
-- 
Hedi Berriche
Global Product Support
http://www.sgi.com/support
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