34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
From e82b9b5a56bcac18cae68878fe67263279805735 Mon Sep 17 00:00:00 2001
|
|
From: "Gautham R. Shenoy" <gautham.shenoy@amd.com>
|
|
Date: Mon, 21 Oct 2024 15:48:35 +0530
|
|
Subject: amd-pstate: Set min_perf to nominal_perf for active mode performance
|
|
gov
|
|
|
|
The amd-pstate driver sets CPPC_REQ.min_perf to CPPC_REQ.max_perf when
|
|
in active mode with performance governor. Typically CPPC_REQ.max_perf
|
|
is set to CPPC.highest_perf. This causes frequency throttling on
|
|
power-limited platforms which causes performance regressions on
|
|
certain classes of workloads.
|
|
|
|
Hence, set the CPPC_REQ.min_perf to the CPPC.nominal_perf or
|
|
CPPC_REQ.max_perf, whichever is lower of the two.
|
|
|
|
Fixes: ffa5096a7c33 ("cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors")
|
|
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
|
|
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
|
|
---
|
|
drivers/cpufreq/amd-pstate.c | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
--- a/drivers/cpufreq/amd-pstate.c
|
|
+++ b/drivers/cpufreq/amd-pstate.c
|
|
@@ -1565,7 +1565,7 @@ static int amd_pstate_epp_update_limit(s
|
|
value = READ_ONCE(cpudata->cppc_req_cached);
|
|
|
|
if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE)
|
|
- min_perf = max_perf;
|
|
+ min_perf = min(cpudata->nominal_perf, max_perf);
|
|
|
|
/* Initial min/max values for CPPC Performance Controls Register */
|
|
value &= ~AMD_CPPC_MIN_PERF(~0L);
|