On Mon, 11 Apr 2011 19:27:21 -0700 Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> wrote: > On Tue, 2011-04-12 at 10:01 +0900, KOSAKI Motohiro wrote: > > > On Mon, 2011-04-11 at 17:19 +0900, KOSAKI Motohiro wrote: > > > > This patch raise zone_reclaim_mode threshold to 30. 30 don't have > > > > specific meaning. but 20 mean one-hop QPI/Hypertransport and such > > > > relatively cheap 2-4 socket machine are often used for tradiotional > > > > server as above. The intention is, their machine don't use > > > > zone_reclaim_mode. > > > > > > I know specifically of pieces of x86 hardware that set the information > > > in the BIOS to '21' *specifically* so they'll get the zone_reclaim_mode > > > behavior which that implies. > > > > Which hardware? > > I'd have to go digging for the model numbers. I just remember having > discussions with folks about it a couple of years ago. My memory isn't > what it used to be. :) > > > The reason why now we decided to change default is the original bug reporter was using > > mere commodity whitebox hardware and very common workload. > > If it is enough commotidy, we have to concern it. but if it is special, we don't care it. > > Hardware vendor should fix a firmware. > > Yeah, it's certainly a "simple" fix. The distance tables can certainly > be adjusted easily, and worked around pretty trivially with boot > options. If we decide to change the generic case, let's also make sure > that we put something else in place simultaneously that is nice for the > folks that don't want it changed. Maybe something DMI-based that digs > for model numbers? > > I'll go try and dig for some more specifics on the hardware so we at > least have something to test on. > How's that digging coming along? I'm pretty wobbly about this patch. Perhaps we should set RECLAIM_DISTANCE to pi/2 or something, to force people to correctly set the dang thing in initscripts. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>