http://bugzilla.kernel.org/show_bug.cgi?id=15064
Summary: i7 turbo boost not working properly
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Processors
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=24575)
--> (http://bugzilla.kernel.org/attachment.cgi?id=24575)
sysbench cpu tests with 1 thread, 4 threads and 8 threads
I have a alienware m15x, with "Turbo mode" enabled in the bios. In windows it
appears to be working properly, but in linux (which is my main enviroment) it
doesn't look like it's working.
I've seen this with multiple programs, I'm attaching sysbench output.
Running 1 thread I get:
avg: 61.71ms
Running 4 threads I get:
avg: 60.64ms
Running 8 threads I get:
avg: 112.34ms
This is a i7 quad core, so I expected the drop between 4 and 8 threads. But
running a single thread should be a higher average as the turbo boost should
kick in.
See this bug on the ubuntu launchpad:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/429036
I believe the original report relates to an issue that might already be solved,
but comment #3 is seeing the same thing I am. He also has some info in comment
#9 where he says it's only his mobile i7's that are affected.
I've also tried using the "i7z" tool found here:
http://code.google.com/p/i7z/
To monitor my performance, now I thought the math was off because of
hyperthreading so the original bugreport is a bit misleading, but there's some
more information here:
http://code.google.com/p/i7z/issues/detail?id=1
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