-- On Sat, 27 Oct 2007, Rui Nuno Capela wrote: > > 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 When things start to freeze, could you capture the output of a sysrq-t. > >> 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 > I have a P4HT laptop (unfortunately with no serial). I use it as one of my main machines, so it will suck for me when it freezes ;-). I'll take your config and try it out. I'll most likely do this on Monday since process Wife has the highest priority over the weekend ;-) -- Steve - 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
