Bug 24742 - Core i7 loses its multithreading capability after suspend
Core i7 loses its multithreading capability after suspend
Status: CLOSED CODE_FIX
Product: Power Management
Classification: Unclassified
Component: Hibernation/Suspend
All Linux
: P1 normal
Assigned To: power-management_other
:
Depends on:
Blocks: 7216
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Reported: 2010-12-12 14:31 UTC by Keivan Moradi
Modified: 2011-01-17 00:28 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.34 r12 gentoo-sources
Tree: Mainline
Regression: No


Attachments

Description Keivan Moradi 2010-12-12 14:31:29 UTC
On my gentoo-linux system (2.6.34-gentoo-sources amd64), with a xeon 5540 (core i7) , each time I resume after the command "pm-suspend" (suspend to RAM), mutlithreading capabilities almost disappear. More specifically, two distinct programs can use 2 distinct cores at full rate, but a single program is limited to only one core (for one instance of a multithreaded program as well as multiple instances of a single threaded program, e.g. "make -j 4" for gcc). So I end up rebooting the system. Any help appreciated!

There are other people have this problem. this is a upstream bug.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=580901

http://codeme.gotdns.com/2010/04/30/core-i7-on-linux-loses-its-multithreading-capability-after-suspend/

http://superuser.com/questions/136291/core-i7-on-linux-loses-its-multithreading-capability-after-suspend

also these bug reports may be related to this one

https://bugzilla.kernel.org/show_bug.cgi?id=16567

https://bugzilla.kernel.org/show_bug.cgi?id=13885
Comment 1 Rafael J. Wysocki 2011-01-16 22:45:54 UTC
Does the problem still occur with 2.6.37?
Comment 2 Keivan Moradi 2011-01-17 00:25:16 UTC
problem solved in 2.6.36

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