From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robin Holt Date: Tue, 24 Jan 2006 17:00:34 +0000 Subject: Re: [PATCH] SN2 user-MMIO CPU migration Message-Id: <20060124170034.GA3629@lnx-holt.americas.sgi.com> List-Id: References: <20060118163305.Y42462@chenjesu.americas.sgi.com> In-Reply-To: <20060118163305.Y42462@chenjesu.americas.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org 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