> On Mon, October 15, 2007 11:49, Rui Nuno Capela wrote: >> >> I am experiencing some highly annoying but intermitent freezing on a >> pentium4 2.80G HT/SMT box, when doing normal desktop work with 2.6.23-rt1. >> >> >> The same crippling behavior does not occur on a Core 2 Due T7200 2.0G >> SMP, so I suspect it's something due specific to the SMT scheduling >> support (Hyper-Threading). But can't tell for sure, obviously :) >> > > I was wrong. After several trials the same behavior also occurs on the > Core2 Duo T7200. It just took longer to show its nasty. > > >> The symptoms are noticeable primarily as some X/GUI intermitent freezing, >> sometimes only one application, then several and ultimately the whole X >> desktop becomes completely unresponsive. It looks like scheduling >> problems. There is this hint that switching to a spare console terminal >> (via Ctrl+Alt+Fn) might cause later recovery. But its just a question of >> some more time for it just happens again and again, one after another, >> several applications becoming temporarily frozen and just by luck the >> system gets back to normal, probably due to some incidental shake-up :) >> but there are other times that nothing seems to help with no alternative >> to the power-reset switch. >> >> I could not find any evidence on dmesg or in the system logs, of any >> apparent trouble. No BUGs, no oops, no panics, no nothing. It just >> freezes, this and that, now and then. It just makes it all unworkable >> and obviously subject to ditching. >> >> Again, this only happens on this P4/HT box. On a Core2 Duo laptop, with >> same 2.6.23-rt1 with the very same kernel configuration, it does not show >> any illness and is running quite fine. >> > > False. It used to run fine, until the creeps happen first time :( > > >> Remember one report I had about a similar freezing behavior? Now it's >> happening the other way around: the core2 is OK, the pentium4 is KO. >> > > Now it applies to all 2.6.23-rt1 images I could test upon. > > >> One naive suspicion goes like the new rcu-preempt code is to blame, since >> I don't remember having this or any other trouble with 2.6.23-rc8-rt1. >> > > Not be sure anymore, but this seems to be still a valid assumption. > just to let you know that still the same trouble persists with 2.6.23.1-rt4 .config can be found here: http://www.rncbc.org/datahub/config-2.6.23.1-rt4.0 cheers. -- rncbc aka Rui Nuno Capela rncbc@xxxxxxxxx - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
