From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ray Bryant Date: Fri, 14 Feb 2003 21:04:52 +0000 Subject: Re: [Linux-ia64] Preempt problems Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Stephane, We're using a 2.4.19 kernel with a number of patches and SGI fixes, and some backports from 2.5, as well as our machine specific stuff. A more complete description of what we run is: --2.4.19 from www.kernel.org --IA64 patch --Atlas patches including discontinguous memory support, VM support --O(1) scheduler -- including some fixes for large CPU counts, etc --SGI machine specific H/W support --SGI patches and fixes for bugs and scalability --PAGG --CSA (Comprehensive System Accounting) --XSCSI (our version of SCSI support from IRIX -- this is a module/closed source) Of interest for this discussion is the O(1) scheduler and perfmon. If you could send me your patch, I will take a look at it and see what applies. We will eventually be going to RHAS, but at the moment we are running a "free-bytes" clone of RH 7.2. I understand exactly why you are trying to keep the number of variations small. Thanks, Stephane Eranian wrote: > > Ray, > > On Fri, Feb 14, 2003 at 02:05:53PM -0600, Ray Bryant wrote: > > > > Does the deadlock you describe here look at all like the bug report that > > Jack Steiner has submitted for our Altix kernel? > > (We're using the O(1) scheduler and pfmon.) (It certainly sound > > similar.) Details attached. > > > > Is anyone working this issue that you know of? > > > This problem was reported to me by Intel and others. It was affecting > the 2.5 kernel only. However given that RHAS 2.1 is also using the > O(1) scheduler, I had to fix it in 2.4.18/RHAS. I don't exactly > know which kernel you are using at SGI. Note that the fix has been > propagated to 2.5.60 as well. I can provide the patch to you but > note that it also includes updates to perfmon to bring it closer > to what we have in 2.4.20. My goal is to minimize the number of > variations out there ;-> > > -- > -Stephane -- Best Regards, Ray ----------------------------------------------- Ray Bryant 512-453-9679 (work) 512-507-7807 (cell) raybry@sgi.com raybry@austin.rr.com The box said: "Requires Windows 98 or better", so I installed Linux. -----------------------------------------------