On Thu, Dec 07, 2017 at 01:26:48PM -0500, Jung-uk Kim wrote: > On 12/07/2017 05:03, Alexey Dokuchaev wrote: > > On Thu, Nov 30, 2017 at 03:08:49PM -0500, Jung-uk Kim wrote: > >> ... > >> Probably. However, I am just trying to fix my FX-8350 and A10-6800 and > >> I don't have Zen processors to verify the MSRs are actually working on > >> those CPUs. > > > > Ah, that's so lovely, thanks Jung-uk; I feel that our support for AMD > > fam. 15h CPUs is lacking. E.g. only four P-states are reported for my > > A8-5550M, while it supports boosted P-states per BKDG, and reading MSRs > > directly via `sysutils/amdmsrtweaker' reports eight of them (P0 .. P7), > > with three turbo P-states P0 P1 P2. > > You don't trust your BIOS? ;-)
Well, I kind of do, with a grain of salt. BIOSes (or shall I say, their CPU support packages) are often poorly written or being too conservative, in order to simplify vendors' job making sure they work across all CPUs. I also like to undervolt them; I'm doing this now with my Pentium M 780 CPU via patched DSDT. I hope that I could do the same for A8-5550M, and with having more P-states than currently provided via stock DSDT for a more fine-grained control. > Unless SSDT is unavailable or broken, we should use ACPI tables first. I know that's correct and recommended procedure; in fact, under Ubuntu, available frequency steps are: 2.10 GHz, 1.90 GHz, 1.70 GHz, 1.40 GHz; also just four (with driver: acpi-cpufreq). I'd have to boot into Win7 to see if it's doing more than that. ./danfe _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
