[PATCH AUTOSEL 5.15 02/10] tools/power turbostat: Fix Bzy_MHz documentation typo

From: Sasha Levin
Date: Mon Apr 22 2024 - 20:16:07 EST


From: Peng Liu <liupeng17@xxxxxxxxxx>

[ Upstream commit 0b13410b52c4636aacb6964a4253a797c0fa0d16 ]

The code calculates Bzy_MHz by multiplying TSC_delta * APERF_delta/MPERF_delta
The man page erroneously showed that TSC_delta was divided.

Signed-off-by: Peng Liu <liupeng17@xxxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/power/x86/turbostat/turbostat.8 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
index b3d4bf08e70b1..f382cd53cb4e8 100644
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -322,7 +322,7 @@ below the processor's base frequency.

Busy% = MPERF_delta/TSC_delta

-Bzy_MHz = TSC_delta/APERF_delta/MPERF_delta/measurement_interval
+Bzy_MHz = TSC_delta*APERF_delta/MPERF_delta/measurement_interval

Note that these calculations depend on TSC_delta, so they
are not reliable during intervals when TSC_MHz is not running at the base frequency.
--
2.43.0