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From 9535680992da4509b22ba0bc9e3da58a21248e71 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Lyson=C4=9Bk?= <olysonek@redhat.com>
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Date: Thu, 6 Feb 2020 17:39:22 +0100
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Subject: [PATCH] Add accelerator-performance profile
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Resolves: rhbz#1795604
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Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>
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---
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man/tuned-profiles.7 | 6 +++
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profiles/accelerator-performance/tuned.conf | 60 +++++++++++++++++++++
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2 files changed, 66 insertions(+)
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create mode 100644 profiles/accelerator-performance/tuned.conf
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diff --git a/man/tuned-profiles.7 b/man/tuned-profiles.7
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index 60a5dc9..aaf140b 100644
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--- a/man/tuned-profiles.7
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+++ b/man/tuned-profiles.7
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@@ -77,6 +77,12 @@ mechanisms and enables sysctl settings that improve the throughput performance
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of your disk and network IO. CPU governor is set to performance and CPU energy
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performance bias is set to performance. Disk readahead values are increased.
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+.TP
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+.BI "accelerator\-performance"
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+This profile contains the same tuning as the throughput\-performance profile.
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+Additionally, it locks the CPU to low C states so that the latency is less than
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+100us. This improves the performance of certain accelerators, such as GPUs.
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+
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.TP
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.BI "latency\-performance"
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Profile for low latency performance tuning. Disables power saving mechanisms.
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diff --git a/profiles/accelerator-performance/tuned.conf b/profiles/accelerator-performance/tuned.conf
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new file mode 100644
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index 0000000..8068b3b
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--- /dev/null
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+++ b/profiles/accelerator-performance/tuned.conf
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@@ -0,0 +1,60 @@
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+#
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+# tuned configuration
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+#
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+
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+[main]
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+summary=Throughput performance based tuning with disabled higher latency STOP states
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+
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+[cpu]
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+governor=performance
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+energy_perf_bias=performance
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+min_perf_pct=100
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+force_latency=99
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+
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+[disk]
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+readahead=>4096
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+
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+[sysctl]
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+# ktune sysctl settings for rhel6 servers, maximizing i/o throughput
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+#
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+# Minimal preemption granularity for CPU-bound tasks:
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+# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)
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+kernel.sched_min_granularity_ns = 10000000
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+
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+# SCHED_OTHER wake-up granularity.
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+# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)
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+#
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+# This option delays the preemption effects of decoupled workloads
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+# and reduces their over-scheduling. Synchronous workloads will still
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+# have immediate wakeup/sleep latencies.
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+kernel.sched_wakeup_granularity_ns = 15000000
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+
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+# If a workload mostly uses anonymous memory and it hits this limit, the entire
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+# working set is buffered for I/O, and any more write buffering would require
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+# swapping, so it's time to throttle writes until I/O can catch up. Workloads
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+# that mostly use file mappings may be able to use even higher values.
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+#
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+# The generator of dirty data starts writeback at this percentage (system default
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+# is 20%)
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+vm.dirty_ratio = 40
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+
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+# Start background writeback (via writeback threads) at this percentage (system
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+# default is 10%)
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+vm.dirty_background_ratio = 10
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+
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+# PID allocation wrap value. When the kernel's next PID value
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+# reaches this value, it wraps back to a minimum PID value.
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+# PIDs of value pid_max or larger are not allocated.
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+#
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+# A suggested value for pid_max is 1024 * <# of cpu cores/threads in system>
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+# e.g., a box with 32 cpus, the default of 32768 is reasonable, for 64 cpus,
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+# 65536, for 4096 cpus, 4194304 (which is the upper limit possible).
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+#kernel.pid_max = 65536
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+
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+# The swappiness parameter controls the tendency of the kernel to move
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+# processes out of physical memory and onto the swap disk.
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+# 0 tells the kernel to avoid swapping processes out of physical memory
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+# for as long as possible
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+# 100 tells the kernel to aggressively swap processes out of physical memory
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+# and move them to swap cache
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+vm.swappiness=10
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--
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2.24.1
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