From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Peng Liu <liupeng17@lenovo.com>, Len Brown <len.brown@intel.com>,
Sasha Levin <sashal@kernel.org>,
lenb@kernel.org, linux-pm@vger.kernel.org
Subject: [PATCH AUTOSEL 5.10 2/9] tools/power turbostat: Fix Bzy_MHz documentation typo
Date: Mon, 22 Apr 2024 19:19:43 -0400 [thread overview]
Message-ID: <20240422231955.1613650-2-sashal@kernel.org> (raw)
In-Reply-To: <20240422231955.1613650-1-sashal@kernel.org>
From: Peng Liu <liupeng17@lenovo.com>
[ 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@lenovo.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 71e3f3a68b9df..f8cc88c56ae8f 100644
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -320,7 +320,7 @@ 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
prev parent reply other threads:[~2024-04-22 23:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-22 23:19 [PATCH AUTOSEL 5.10 1/9] tools/power turbostat: Fix added raw MSR output Sasha Levin
2024-04-22 23:19 ` Sasha Levin [this message]
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