On Sun, 3 Apr 2005, Dave Hansen wrote: > On Sun, 2005-04-03 at 15:37 +0100, Mel Gorman wrote: > > While testing the page placement policy patches on 2.6.12-rc1, I noticed > > that aim9 is showing significant slowdowns on page allocation-related > > tests. An excerpt of the results is at the end of this mail but it shows > > that page_test is allocating 18000 less pages. > > > > I did not check who has been recently changing the buddy allocator but > > they might want to run a benchmark or two to make sure this is not > > something specific to my setup. > > Can you get some kernel profiles to see what, exactly, is causing the > decreased performance? Also, what kind of system do you have? Does > backing this out help? If not, can you test some BK snapshots to see > when this started occurring? > > http://linus.bkbits.net:8080/linux-2.5/[EMAIL PROTECTED] >
The machine is a quad xeon with P III 733 processors. I don't have profile information available as I wasn't collecting as I went along. However, backing out the patch made little difference However, I reran the test on 2.6.11 and this time the performance difference was a lot less. Something else must have been happening when I collected the first set of poor results. I'll revisit this when I'm next working on kernel stuff and see can I reproduce it again reliably. -- Mel Gorman Part-time Phd Student Java Applications Developer University of Limerick IBM Dublin Software Lab - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
