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From: Peng Liu <pngliu@hotmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: lenb@kernel.org, linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org, liupeng17@lenovo.com
Subject: [PATCH] tools/power turbostat: Fix Bzy_MHz calculation equation
Date: Sat,  7 Oct 2023 13:46:22 +0800	[thread overview]
Message-ID: <TYCP286MB214616F6AE3E088C5D781A2EC6C8A@TYCP286MB2146.JPNP286.PROD.OUTLOOK.COM> (raw)

From: Peng Liu <liupeng17@lenovo.com>

To calculate Bzy_MHz, TSC_delta should multiply APERF_delta instead
of dividing it.

Signed-off-by: Peng Liu <liupeng17@lenovo.com>
---
 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 8f08c3fd498d..1ba6340d3b3d 100644
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -370,7 +370,7 @@ 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.
-- 
2.34.1


             reply	other threads:[~2023-10-07  5:46 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-07  5:46 Peng Liu [this message]
2023-10-30  3:11 ` [PATCH] tools/power turbostat: Fix Bzy_MHz calculation equation Peng Liu
2023-11-02 15:31   ` Doug Smythies
2023-11-03  1:55     ` Peng Liu
2023-11-03  4:48     ` Wyes Karny
2023-11-28  1:39     ` Len Brown
2023-11-29  1:57       ` 回复: [External] " Peng Peng17 Liu

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