Re: HELP: Is writeq an atomic operation??

Andi Kleen
2008-05-02T23:13:55Z

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