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Don't auto-enable _flush_io on non-rotational media, it's too costly

This commit is contained in:
Panu Matilainen 2020-06-03 10:25:34 +03:00
parent bd27fcf3b7
commit 220819b9e7
2 changed files with 39 additions and 1 deletions
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34
0001-Don-t-auto-enable-IO-flushing-on-non-rotational-disk.patch Normal file
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@ -0,0 +1,34 @@
From ca78aff0bcf36b480e9776535ab3e74dbb5a8f50 Mon Sep 17 00:00:00 2001
Message-Id: <ca78aff0bcf36b480e9776535ab3e74dbb5a8f50.1591169016.git.pmatilai@redhat.com>
From: Panu Matilainen <pmatilai@redhat.com>
Date: Wed, 3 Jun 2020 10:17:33 +0300
Subject: [PATCH] Don't auto-enable IO flushing on non-rotational disks
Commit 47e2463d8a98a7535e141d59d17be17d5a30862c added logic to enable
%_flush_io automatically on non-rotational disks to avoid trashing system
caches and IO peaks on the grounds that this isn't so expensive on SSD,
but real world experience suggests otherwise. Install times go from
seconds to minutes which might not matter for the random individual system
but for build systems and the like churning away continuously...
---
lib/transaction.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/lib/transaction.c b/lib/transaction.c
index 49b564f8d..1156bb9f5 100644
--- a/lib/transaction.c
+++ b/lib/transaction.c
@@ -1478,10 +1478,8 @@ static void setSSD(int enable)
if (enable) {
rpmlog(RPMLOG_DEBUG, "optimizing for non-rotational disks\n");
ensureMacro("_minimize_writes", "1");
- ensureMacro("_flush_io", "1");
} else {
rpmPopMacro(NULL, "_minimize_writes");
- rpmPopMacro(NULL, "_flush_io");
}
}
--
2.26.2

6
rpm.spec
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@ -25,7 +25,7 @@
%global rpmver 4.16.0
%global snapver beta1
%global rel 1
%global rel 2
%global srcver %{rpmver}%{?snapver:-%{snapver}}
%global srcdir %{?snapver:testing}%{!?snapver:rpm-%(echo %{rpmver} | cut -d'.' -f1-2).x}
@ -59,6 +59,7 @@ Patch5: rpm-4.12.0-rpm2cpio-hack.patch
Patch6: 0001-find-debuginfo.sh-decompress-DWARF-compressed-ELF-se.patch
# Patches already upstream:
Patch100: 0001-Don-t-auto-enable-IO-flushing-on-non-rotational-disk.patch
# These are not yet upstream
Patch906: rpm-4.7.1-geode-i686.patch
@ -552,6 +553,9 @@ fi
%doc doc/librpm/html/*
%changelog
* Wed Jun 3 2020 Panu Matilainen <pmatilai@redhat.com> - 4.16.0-0.beta1.2
- Don't auto-enable _flush_io on non-rotational media, it's too costly
* Mon Jun 1 2020 Panu Matilainen <pmatilai@redhat.com> - 4.16.0-0.beta1.1
- Rebase to rpm 4.16.0-beta1