Skip to content

opal: Get x86 TSC frequency from bogomips #3869

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Aug 1, 2017
Merged

opal: Get x86 TSC frequency from bogomips #3869

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
15 changes: 15 additions & 0 deletions opal/mca/timer/linux/timer_linux_component.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,21 @@ static int opal_timer_linux_find_freq(void)
}
}

#if ((OPAL_ASSEMBLY_ARCH == OPAL_IA32) || (OPAL_ASSEMBLY_ARCH == OPAL_X86_64))
if (0 == opal_timer_linux_freq && opal_sys_timer_is_monotonic()) {
/* tsc is exposed through bogomips ~> loops_per_jiffy ~> tsc_khz */
loc = find_info(fp, "bogomips", buf, 1024);
if (NULL != loc) {
ret = sscanf(loc, "%f", &cpu_f);
if (1 == ret) {
/* number is in MHz * 2 and has 2 decimal digits
convert to Hz and make an integer */
opal_timer_linux_freq = (opal_timer_t) (cpu_f * 100.0f) * 5000;
}
}
}
#endif

if (0 == opal_timer_linux_freq) {
/* find the CPU speed - most timers are 1:1 with CPU speed */
loc = find_info(fp, "cpu MHz", buf, 1024);
Expand Down