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From: Florian Pritz on 15 Mar 2010 17:20 Hi, When I run make -j12 (on a kernel tree) all 8 cores are at 100% each. (Can also be tested with stress -c 8 or any multithreaded program) After a suspend2ram (using pm-suspend) only one single core is at 100% and the others are somewhere between 0% and 10% though not 100% like before. This bug is reproduceable on at least 3 machines, running on i7-920, i7-860 and i5-520M. Tested kernels are 2.6.33-ARCH (config [1]) , 2.6.32.9-ARCH and 2.6.34-rc1-00005-g522dba7 (only be me; config [2]). /proc/cpuinfo shows 8 cpus before and after suspend. My own hardware: CPU: Intel i7-920 Board: Gigabyte GA-EX58-UD4P [3] RAM: 8GB Arch: x86_64 (all 3) Distribution: Archlinux (all 3) I don't know of any older good kernel, so sadly can't bisect anything. Thanks for looking into that issue. [1] http://repos.archlinux.org/wsvn/packages/kernel26/trunk/config.x86_64?rev=70484&peg=70484 [2] http://flo.xssn.at/~flo/tmp/kernel-config [3] http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=2986 -- Greetings, Florian Pritz -- {flo,bluewind}@server-speed.net -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Rafael J. Wysocki on 18 Mar 2010 16:00
Hi, Here's an interesting issue, apparently Core i5 and i7 have problems after resume from suspend/standby. I wonder whom at Intel I should let know about that. Rafael On Thursday 18 March 2010, bugzilla-daemon(a)bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=15559 > > > > > > --- Comment #3 from Thomas Bächler <thomas(a)archlinux.org> 2010-03-18 18:42:26 --- > I have only tested 2.6.33 and 2.6.33.1, as this machine is quite new. Besides > other unrelated suspend problems, I can always reproduce this one on a Core > i5-520M, the symptoms are exactly the ones that Florian describes. > > The diversity of hardware and different kernels here suggests that this is a > general problem with the i5 and i7 CPUs on Linux. Also interesting is that > Florian is using an i7 of the 2009 generation, while I use the 2010 i5 CPU and > the bug is the same on both. > > On the same kernel(s), my old Core 2 Duo CPU has no trouble after resume, all > cores are still being used as usual. > > If you need any more info, I think we will be able to provide anything you > need. Maybe it might also be useful to bring someone from Intel in on this. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |