On 26/10/2015 18:52, Jan Beulich wrote: > >>> On 26.10.15 at 11:45, <wei.w.w...@intel.com> wrote: > > On 26/10/2015 18:37, Jan Beulich wrote: > >> >>> On 26.10.15 at 11:19, <wei.w.w...@intel.com> wrote: > >> > On 26/10/2015 17:54, Jan Beulich wrote: > >> >> That wasn't the question; I rather inquired what "meaning at the same > time" > >> >> both fields have. > >> > > >> > turbo_enable: indicates if turbo is enabled or not. > >> > turbo_pct: shows the capability of turbo in percentage. For example > >> > if the CPU has the following operating frequency range: > >> > From [Min] to [Max]: 1.2GH, 1.3GHZ,1.4GHZ,...,2.3GHZ, so > >> > 1.2--->2.3, length = 12 Turbo frequency: 3.7GHZ, so 1.2---->3.7, > >> > length = 26 Then turbo_pct = (26 - 12) / 26 = 54%, that is turbo_pct = > >> > 54. > >> > >> So what meaning does e.g. "turbo_enabled = 1" plus "turbo_pct = 0" > >> have? Or "turbo_enabled = 0" plus "turbo_pct > 0"? > > > > " turbo_pct = 54" is the property of the CPU, just like MAX=3.7GHZ. It > > should be something engraved on stone, not changeable. So, I think > > it's not a good idea to put them together. > > That's a valid statement, but not really an answer to the question(s) raised.
My point is that we should not discuss the two together, since they are not related to each other. The answer is obvious: "turbo_enabled = 1" plus "turbo_pct = 0", is not a possible case, since turbo_pct always equals to 54, as the valid statement states. However, if the CPU doesn't support turbo, then turbo_enabled won't be 1. "turbo_enabled = 0" plus "turbo_pct =54", simply means that the CPU has its turbo function switched off, though it has a turbo capability of 54%. Best, Wei _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
