On 07/20/2012 05:08 PM, Mike Galbraith wrote: > On Fri, 2012-07-20 at 16:30 +0800, Michael Wang wrote: >> On 07/20/2012 03:00 PM, Mike Galbraith wrote: >>> On Fri, 2012-07-20 at 11:09 +0800, Michael Wang wrote: >>>> Hi, Mike, Martin, Dan >>>> >>>> I'm currently taking an eye on the rcu stall issue which was reported by >>>> you in the mail: >>>> >>>> rcu: endless stalls >>>> From: Mike Galbraith >>>> linux-3.4-rc7: rcu_sched self-detected stall on CPU >>>> From: Martin Mokrejs >>>> RCU stalls in linux-next >>>> From: Dan Carpenter >>>> >>>> I try to reproduce the issue on my X86 server with 12 cpu >>> >>> The 'endless stalls' box was 341.33333 times larger. Dunno if you can >>> even set a serial port slow enough to approximate all cores trying to >>> gripe through a single pinhole simultaneously. >> >> Hi, Mike >> >> Thanks for your reply. >> >> So you mean this issue is still existing on you box and you can see it >> without doing any special things? > > It's not my box (thank god). It was initially triggered by tasks > exiting simultaneously on all cores. They jammed up, endless stall > followed. > >> I just want to try to reproduce it but it's impossible for me to get >> some hardware as yours... >> >> So is there any idea on how to reproduce it on normal hardware? > > No, AFAIK this problem is restricted to size XXL boxen, with all the > joys that come along with having way too many CPUs.
I see, thanks for your info, looks like it's hard to reproduce on normal servers like mine... Regards, Michael Wang > > -Mike > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
