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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2021-03-08 16:31:46 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-03-18 19:36:34 +0100
commitd484b8bfc6fa71a088e4ac85d9ce11aa0385867e (patch)
treeb54e95908da495630a477c51761c3525bbc976a7 /drivers/idle
parent1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff)
intel_idle: update ICX C6 data
Change IceLake Xeon C6 latency from 128 us to 170 us. The latency was measured with the "wult" tool and corresponds to the 99.99th percentile when measuring with the "nic" method. Note, the 128 us figure correspond to the median latency, but in intel_idle we use the "worst case" latency figure instead. C6 target residency was increased from 384 us to 600 us, which may result in less C6 residency in some workloads. This value was tested and compared to values 384, and 1000. Value 600 is a reasonable tradeoff between power and performance. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/idle')
-rw-r--r--drivers/idle/intel_idle.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 3273360f30f7..6cac0b748efa 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -744,8 +744,8 @@ static struct cpuidle_state icx_cstates[] __initdata = {
.name = "C6",
.desc = "MWAIT 0x20",
.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
- .exit_latency = 128,
- .target_residency = 384,
+ .exit_latency = 170,
+ .target_residency = 600,
.enter = &intel_idle,
.enter_s2idle = intel_idle_s2idle, },
{