91 lines
3.5 KiB
Diff
91 lines
3.5 KiB
Diff
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From e9c6f500f4429c32f583d6da11352b2f0bcce4c8 Mon Sep 17 00:00:00 2001
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From: "Jan Alexander Steffens (heftig)" <jan.steffens@gmail.com>
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Date: Mon, 27 Jan 2020 18:27:16 +0100
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Subject: ZEN: INTERACTIVE: Tune ondemand governor for interactivity
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4.10:
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During some personal testing with the Dolphin emulator, MuQSS has
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serious problems scaling its frequencies causing poor performance where
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boosting the CPU frequencies would have fixed them. Reducing the
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up_threshold to 45 with MuQSS appears to fix the issue, letting the
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introduction to "Star Wars: Rogue Leader" run at 100% speed versus about
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80% on my test system.
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Also, lets refactor the definitions and include some indentation to help
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the reader discern what the scope of all the macros are.
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5.4:
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On the last custom kernel benchmark from Phoronix with Xanmod, Michael
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configured all the kernels to run using ondemand instead of the kernel's
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[default selection][1]. This reminded me that another option outside of
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the kernels control is the user's choice to change the cpufreq governor,
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for better or for worse.
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In Liquorix, performance is the default governor whether you're running
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acpi-cpufreq or intel-pstate. I expect laptop users to install TLP or
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LMT to control the power balance on their system, especially when
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they're plugged in or on battery. However, it's pretty clear to me a
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lot of people would choose ondemand over performance since it's not
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obvious it has huge performance ramifications with MuQSS, and ondemand
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otherwise is "good enough" for most people.
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Lets codify lower up thresholds for MuQSS to more closely synergize with
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its aggressive thread migration behavior. This way when ondemand is
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configured, you get sort of a "performance-lite" type of result but with
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the power savings you expect when leaving the running system idle.
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[1]: https://www.phoronix.com/scan.php?page=article&item=xanmod-2020-kernel
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5.14:
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Although CFS and similar schedulers (BMQ, PDS, and CacULE), reuse a lot
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more of mainline scheduling and do a good job of pinning single threaded
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tasks to their respective core, there's still applications that
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confusingly run steady near 50% and benefit from going full speed or
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turbo when they need to run (emulators for more recent consoles come to
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mind).
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Drop the up threshold for all non-MuQSS schedulers from 80/95 to 55/60.
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5.15:
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Remove MuQSS cpufreq configuration.
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---
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drivers/cpufreq/cpufreq_ondemand.c | 8 +++++++-
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init/Kconfig | 6 ++++++
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2 files changed, 13 insertions(+), 1 deletion(-)
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--- a/drivers/cpufreq/cpufreq_ondemand.c
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+++ b/drivers/cpufreq/cpufreq_ondemand.c
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@@ -18,10 +18,16 @@
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#include "cpufreq_ondemand.h"
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/* On-demand governor macros */
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+#if defined(CONFIG_ZEN_INTERACTIVE)
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+#define DEF_FREQUENCY_UP_THRESHOLD (55)
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+#define MICRO_FREQUENCY_UP_THRESHOLD (60)
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+#define DEF_SAMPLING_DOWN_FACTOR (5)
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+#else
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#define DEF_FREQUENCY_UP_THRESHOLD (63)
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+#define MICRO_FREQUENCY_UP_THRESHOLD (70)
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#define DEF_SAMPLING_DOWN_FACTOR (100)
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+#endif
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#define MAX_SAMPLING_DOWN_FACTOR (100000)
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-#define MICRO_FREQUENCY_UP_THRESHOLD (70)
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#define MIN_FREQUENCY_UP_THRESHOLD (1)
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#define MAX_FREQUENCY_UP_THRESHOLD (100)
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -157,6 +157,12 @@ config ZEN_INTERACTIVE
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Bandwidth slice size...........: 5 -> 3 ms
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Task rebalancing threshold.....: 32 -> 8
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+ --- CPUFreq Settings -----------------------------------
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+
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+ Ondemand sampling down factor..: 100 -> 5
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+ Ondemand default up threshold..: 63 -> 55
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+ Ondemand micro up threshold....: 70 -> 60
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+
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config BROKEN
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bool
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