* [Bug 42924] /proc/cpuinfo reports wrong frequency (compared to cpufreq-info) [not found] <bug-42924-12968@https.bugzilla.kernel.org/> @ 2013-01-29 3:48 ` bugzilla-daemon 2013-01-29 3:48 ` bugzilla-daemon 1 sibling, 0 replies; 2+ messages in thread From: bugzilla-daemon @ 2013-01-29 3:48 UTC (permalink / raw) To: cpufreq https://bugzilla.kernel.org/show_bug.cgi?id=42924 Len Brown <lenb@kernel.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Component|Config-Processors |cpufreq Resolution| |DOCUMENTED AssignedTo|lenb@kernel.org |cpufreq@vger.kernel.org Product|ACPI |Power Management --- Comment #2 from Len Brown <lenb@kernel.org> 2013-01-29 03:48:21 --- turbostat tells the truth about what the HW is doing. So in this case, all 4 threads (2 cores) are running at 3.3 GHz. cpufreq is showing you 2.8 b/c that is what the OS requested. It doesn't know that turbo HW can deliver 3.3 when it requests 2.801. Also, on multi-core systems, the voltage is raised to support the highest frequency request and all the cores run at that frequency. Here 3 cpus asked for 2.8 and cpu0 asked for 800. But cpu0 will run at the same speed of the others even though it last requested less. This is a longstanding problem with /proc/cpuinfo -- it is showing a cached request value, not an actual value. The values in cpufreq are only slightly better... Some day we may fix this, but probably only after some major surgery (or wholesale replacement) of cpufreq. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug 42924] /proc/cpuinfo reports wrong frequency (compared to cpufreq-info) [not found] <bug-42924-12968@https.bugzilla.kernel.org/> 2013-01-29 3:48 ` [Bug 42924] /proc/cpuinfo reports wrong frequency (compared to cpufreq-info) bugzilla-daemon @ 2013-01-29 3:48 ` bugzilla-daemon 1 sibling, 0 replies; 2+ messages in thread From: bugzilla-daemon @ 2013-01-29 3:48 UTC (permalink / raw) To: cpufreq https://bugzilla.kernel.org/show_bug.cgi?id=42924 Len Brown <lenb@kernel.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |CLOSED -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2013-01-29 3:48 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
[not found] <bug-42924-12968@https.bugzilla.kernel.org/>
2013-01-29 3:48 ` [Bug 42924] /proc/cpuinfo reports wrong frequency (compared to cpufreq-info) bugzilla-daemon
2013-01-29 3:48 ` bugzilla-daemon
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox