Re: [PATCH] SN2 user-MMIO CPU migration

Robin Holt
2006-01-24T17:00:34Z

On Tue, Jan 24, 2006 at 10:57:13AM -0600, Brent Casavant wrote:
> On Tue, 24 Jan 2006, Robin Holt wrote:
>
> > The mspec driver does. It has not gotten into the mainline kernel yet,
> > but we continue to build an add-on module for the necessary releases.
> > To prevent this out of order write from happening on those machines,
> > we require the process to be pinned to a single cpu. For MPI, this
> > is a normal way to operate for other reasons as well.
>
> Oh, this problem affects mspec as well? I didn't realize that. You're
> saying that uncached memory writes are the same as PIO writes, as far
> as Shub is concerned? If so, then the patch I'm trying to work through
> here should solve your problem as well.

Sorry, I wrote that before having any morning coffee. mspec driver is
uncached space so ignore my earlier rambling.

Thanks,
Robin