Date: Tue, 10 Sep 2019 15:01:56 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 240475] [PATCH]: Add support for CPUID 0x16 in tsc_freq_cpuid() (TSC clock) Message-ID: <bug-240475-227@https.bugs.freebsd.org/bugzilla/>
index | next in thread | raw e-mail
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240475 Bug ID: 240475 Summary: [PATCH]: Add support for CPUID 0x16 in tsc_freq_cpuid() (TSC clock) Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: neel@neelc.org Created attachment 207346 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=207346&action=edit Patch (Revision 1) Keep in mind that I am new to the kernel. Description: If frequency for CPUID 0x15 is zero, fall back to CPUID 0x16 for the TSC clock if available. This is needed on some Intel SOCs like Skylake and Kaby Lake whcih report 0 for the crystal clock.. Inspired by Linux commit 604dc9170f2435d27da5039a3efd757dceadc684. Tested on the HP Spectre x360 13-ap0043dx running 13-CURRENT with an accurate clock using this patch (without the patch, the ticks are slower). -- You are receiving this mail because: You are the assignee for the bug.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-240475-227>