From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 11 Sep 2006 09:35:49 -0700 From: Andrew Morton Subject: Re: -mm numa perf regression Message-Id: <20060911093549.a553cfe5.akpm@osdl.org> In-Reply-To: <45057055.7070003@shadowen.org> References: <20060901105554.780e9e78.akpm@osdl.org> <44F88236.10803@google.com> <44F8949E.4010308@google.com> <44F8970F.2050004@google.com> <44F8BB87.7050402@shadowen.org> <45017C95.90502@shadowen.org> <45057055.7070003@shadowen.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andy Whitcroft , linux-mm@kvack.org Cc: Christoph Lameter , Martin Bligh , Paul Jackson List-ID: On Mon, 11 Sep 2006 15:19:01 +0100 Andy Whitcroft wrote: > Christoph Lameter wrote: > > On Fri, 8 Sep 2006, Andy Whitcroft wrote: > > > >>> I have not heard back from you on this issue. It would be good to have > >>> some more data on this one. > >> Sorry I submitted the tests and the results filtered out to TKO, and > >> then I forgot to check them. Looking at the graph backing this out has > >> had no effect. As I think we'd expect from what comes below. > >> > >> What next? > > > > Get me the promised data? /proc/zoneinfo before and after the run. > > /proc/meminfo and /sys/devices/system/node/node*/* would be helpful. > > Sorry for the delay, the relevant files wern't all being preserved. > Fixed that up and reran things. The results you asked for are available > here: > > http://www.shadowen.org/~apw/public/debug-moe-perf/47138/ > > Just having a quick look at the results, it seems that they are saying > that all of our cpu's are in node 0 which isn't right at all. The > machine has 4 processors per node. > > I am sure that would account for the performance loss. Now as to why ... > > > Is there a way to remotely access the box? > > Sadly no ... I do have direct access to test on the box but am not able > to export it. > > I've also started a bisection looking for it. Though that will be some > time yet as I've only just dropped the cleaver for the first time. > I've added linux-mm. Can we please keep it on-list. I have a vague suspicion that your bisection will end up pointing at one Mel Gorman. Or someone else. But whoever it is will end up wondering wtf is going on. I don't understand what you mean by "all of our cpu's are in node 0"? http://www.shadowen.org/~apw/public/debug-moe-perf/47138/sys/devices/system/node.after/node0/ and http://www.shadowen.org/~apw/public/debug-moe-perf/47138/sys/devices/system/node.before/node0/ look the same.. It depends what "before" and "after" mean, I guess... Do we have full dmesg output for both 2.6.18-rc6-mm1 and 2.6.18-rc6? Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org