Re: [PATCH] SN2 user-MMIO CPU migration

From: Robin Holt <holt_at_sgi.com>
Date: 2006-01-25 04:00:34
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
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Received on Wed Jan 25 04:01:25 2006

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