Core i7 on linux loses its multithreading capability after suspend

Posted by rafak on Super User See other posts from Super User or by rafak
Published on 2010-04-30T07:59:01Z Indexed on 2010/04/30 8:07 UTC
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Filed under:

linux

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intel-core-i7

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multi-threaded

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multi-core

On my debian-linux system, with a core i7 920 , 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 monothreaded program, e.g. "make -j 4" for gcc). So I end up rebooting the system. Any help appreciated!

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