linux-kernel - Re: HELP: Is writeq an atomic operation??

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Message-ID: <481BA025.8020804@firstfloor.org>
Date:	Sat, 03 May 2008 01:13:41 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Moore, Eric" <Eric.Moore@....com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: HELP:  Is writeq an atomic operation??

Moore, Eric wrote:
> On Friday, May 02, 2008 4:50 PM, Andi Kleen wrote: 
>>> Here is a trace from pci express analyzer.   I'm sending
>> With what CPU/chipset was that?
>>
> 
> I'm developing sas driver for next generation controllers.  They should
> work at least on x86, x86_64, ia64, and ppc64.  The host I was using for
> gathering that trace was  x86_64 Intel Platform.  Here is the lspci
> output:

I doubt the CPU was to blame. Probably the chipset split it up for some
reason. Did you check the data sheets?

At the CPU level writeq is simply a 64bit store on x86-64 Linux.

-Andi
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