[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2] cpufreq, powernow: enable/disable core performance boost for all cpus in policy
>>> On 20.06.13 at 01:07, Jacob Shin <jacob.shin@xxxxxxx> wrote: > On Wed, Jun 19, 2013 at 03:14:46PM -0500, Jacob Shin wrote: >> Currently, enable/disable turbo mode on AMD is broken: >> >> $ xenpm enable-turbo-mode 0 <-- works and proper CPU MSR bit is set >> $ xenpm enable-turbo-mode 1 <-- silently broken, MSR bit not set >> >> Since ->turbo is per policy, when user requests to enable/disable >> turbo mode, we need to set the bit in all of the ->cpus that this >> policy affects. > > Sorry, I'll have to re-do this [PATCH 1/2], as it does not solve the > problem on platforms with a separate policy per CPU. But isn't a separate policy per CPU meaning that indeed you want to only fiddle with the one CPU that the policy is getting changed for? > 1. We'll have to either globally enable/disable boost for all CPUs, or That's clearly not a good path, as the interface is specifically intending to allow per-policy control. > 2. [if there is a easy way to do so] find all Node siblings and set > their bits and policy->turbo as well. That would be the way to go, pending clarification on the above. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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