linux-kernel - Re: Question about DEC Alpha memory ordering

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Message-ID: <20170213191422.GA64569@skade.schwarzvogel.de>
Date:   Mon, 13 Feb 2017 20:14:23 +0100
From:   Tobias Klausmann <klausman@...warzvogel.de>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     bob smith <sfmc68@...izon.net>, rth@...ddle.net,
        ink@...assic.park.msu.ru, mattst88@...il.com,
        stern@...land.harvard.edu, j.alglave@....ac.uk,
        luc.maranget@...ia.fr, parri.andrea@...il.com, will.deacon@....com,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Question about DEC Alpha memory ordering

Hi! 

On Mon, 13 Feb 2017, Paul E. McKenney wrote:
> On Mon, Feb 13, 2017 at 01:53:27PM -0500, bob smith wrote:
> > On 2/13/17 1:39 PM, Paul E. McKenney wrote:
> > > can real DEC Alpha hardware end up with both instances of "r1"
> > > having the value 1?
> > 
> > I thought this question reminded me of something, so I found this:
> > > https://www.kernel.org/doc/Documentation/memory-barriers.txt
> > 
> > and I pasted in the content - David Howells is one of the authors and
> > maybe that is why the question sort of reminded me.
> > 
> > Maybe someone has an update but this is what was said then.
> 
> Well, thank you for pointing me to this, but my question was intended to
> check whether or not the words I helped to write in memory-barriers.txt
> are in fact accurate.  So if you have an SMP DEC Alpha system that you
> could provide remote access to, that would be very helpful!

I have a 4-cpu ES40. Send me a test program and I'll gladly run
it for you.

Regards,
Tobias

-- 
Sent from aboard the Culture ship
	Stargazer Sober Counsel (Zetetic Elench)