50 lines
2.2 KiB
Diff
50 lines
2.2 KiB
Diff
From 3c7673320dbc70197230e3ebc977be69d1c35870 Mon Sep 17 00:00:00 2001
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Message-Id: <3c7673320dbc70197230e3ebc977be69d1c35870.1524081065.git.Jim.Somerville@windriver.com>
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In-Reply-To: <8d084dcc717666af0283e4ddeefaba7e331d879a.1524081065.git.Jim.Somerville@windriver.com>
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References: <8d084dcc717666af0283e4ddeefaba7e331d879a.1524081065.git.Jim.Somerville@windriver.com>
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From: Alex Kozyrev <alex.kozyrev@windriver.com>
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Date: Mon, 11 Sep 2017 17:05:22 -0400
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Subject: [PATCH 28/39] fix high latency reported by cyclictest
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CGTS-7179 reported cyclictest latency spikes on low-latency compute profile.
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The issue was injected into TC during kernel rebase to 3.10.0-514.16.1.el7.
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Latency has been hurt by addition of the timer_migration sysctl.
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To cure the issue we need to port back two patches from latest stable kernel:
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bc7a34b8b9ebfb0f4b8a35a72a0b134fd6c5ef50
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timer: Reduce timer migration overhead if disabled
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683be13a284720205228e29207ef11a1c3c322b9
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timer: Minimize nohz off overhead
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Little modification were required to apply these patches nicely.
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Signed-off-by: Alex Kozyrev <alex.kozyrev@windriver.com>
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Signed-off-by: Jim Somerville <Jim.Somerville@windriver.com>
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---
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SPECS/kernel-rt.spec | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/SPECS/kernel-rt.spec b/SPECS/kernel-rt.spec
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index ca8fb19..69ba548 100644
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--- a/SPECS/kernel-rt.spec
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+++ b/SPECS/kernel-rt.spec
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@@ -427,6 +427,8 @@ Patch1032: nfsd-check-for-oversized-NFSv2-v3-arguments.patch
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Patch1033: nfsd4-minor-NFSv2-v3-write-decoding-cleanup.patch
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Patch1034: nfsd-stricter-decoding-of-write-like-NFSv2-v3-ops.patch
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Patch1035: US101216-IMA-support-in-Titanium-kernel.patch
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+Patch1036: timer-reduce-timer-migration-overhead-if-disabled.patch
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+Patch1037: timer-minimize-nohz-off-overhead.patch
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BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
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@@ -822,6 +824,8 @@ ApplyPatch nfsd-check-for-oversized-NFSv2-v3-arguments.patch
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ApplyPatch nfsd4-minor-NFSv2-v3-write-decoding-cleanup.patch
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ApplyPatch nfsd-stricter-decoding-of-write-like-NFSv2-v3-ops.patch
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ApplyPatch US101216-IMA-support-in-Titanium-kernel.patch
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+ApplyPatch timer-reduce-timer-migration-overhead-if-disabled.patch
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+ApplyPatch timer-minimize-nohz-off-overhead.patch
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# move off upstream version mechanism
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if [ -e localversion-rt ]; then
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--
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1.8.3.1
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