From d33d6b7ea2738251074146ada64f56e428ceeae5 Mon Sep 17 00:00:00 2001
From: "Jan Alexander Steffens (heftig)" <jan.steffens@gmail.com>
Date: Thu, 18 May 2017 22:38:53 +0200
Subject: [PATCH] roles/archbuild: Merge distro swap.conf
---
roles/archbuild/files/swap.conf | 51 +++++++++++++++++----------------
1 file changed, 26 insertions(+), 25 deletions(-)
diff --git a/roles/archbuild/files/swap.conf b/roles/archbuild/files/swap.conf
index 45332c363..6fb7687e5 100644
--- a/roles/archbuild/files/swap.conf
+++ b/roles/archbuild/files/swap.conf
@@ -10,9 +10,9 @@
# https://www.kernel.org/doc/Documentation/vm/zswap.txt
zswap_enabled=1
-zswap_compressor=lz4
-zswap_max_pool_percent=25
-zswap_zpool=z3fold
+zswap_compressor=lz4 # lzo lz4
+zswap_max_pool_percent=25 # 1-99
+zswap_zpool=z3fold # zbud z3fold
################################################################################
# ZRam
@@ -22,10 +22,10 @@ zswap_zpool=z3fold
# https://www.kernel.org/doc/Documentation/blockdev/zram.txt
zram_enabled=0
-zram_size=$(($ram_size/4))K # This is 1/4 of ram size by default.
+zram_size=$(($ram_size/4))K # This is 1/4 of ram size by default.
zram_streams=$cpu_count
-zram_alg=lz4 # lzo lz4 deflate lz4hc 842 - for Linux 4.8.4
-zram_prio=32767
+zram_alg=lz4 # lzo lz4 deflate lz4hc 842 - for Linux 4.8.4
+zram_prio=32767 # 1 - 32767
################################################################################
# Swap File Universal
@@ -44,27 +44,28 @@ swapfu_directio=0
# files with size 2G (mounted by loop), fs: btrfs
# fio: test 4k, randrw, iodepth 64, libaio, directio 1
# HDD 1TB 5400k
-# loop directio 0 Behaviour IO/s
-# prealloc=0 + nocow=0 - NOT stable speed ~ 2400
-# prealloc=1 + nocow=0 - stable speed, HORRIBLY SLOW ~ 160
-# prealloc=0 + nocow=1 - stable speed, can degraded by time ~ 3300
-# prealloc=1 + nocow=1 - stable speed ~ 2000
-# loop directio 1
-# prealloc=0 + nocow=0 - not stable speed ~ 50
-# prealloc=1 + nocow=0 - not stable speed ~ 69
-# prealloc=0 + nocow=1 - not stable speed ~ 63
-# prealloc=1 + nocow=1 - not stable speed ~ 75
-# raw file (loop device are slow)
-# prealloc=0 + nocow=0 - not stable speed ~ 7600
-# prealloc=1 + nocow=0 - not stable speed ~ 69
-# prealloc=0 + nocow=1 - not stable speed ~ 13000
-# prealloc=1 + nocow=1 - not stable speed ~ 174
+# Loop device:
+# PREALLOC | NoCoW | DirectIO | ~ IO/s | Comment
+# - | - | - | 2400 | NOT stable speed
+# + | - | - | 160 | stable speed, HORRIBLY SLOW
+# - | + | - | 3300 | stable speed, can degraded by time
+# + | + | - | 2000 | stable speed
+# - | - | + | 50 | not stable speed
+# + | - | + | 69 | not stable speed
+# - | + | + | 63 | not stable speed
+# + | + | + | 75 | not stable speed
+# raw file (loop device are slow):
+# PREALLOC | NoCoW | DirectIO | ~ IO/s | Comment
+# - | - | + | 7600 | not stable speed
+# + | - | + | 69 | not stable speed
+# - | + | + | 13000 | not stable speed
+# + | + | + | 174 | not stable speed
# File will not be available in fs after script start
# Make sure what script can access to this path during the boot process.
# Full path to swapfile
-swapfu_path=/var/swap
-swapfu_prio=-1024
+swapfu_path=/var/lib/systemd-swap/swapfu
+swapfu_prio=1 # 1 - 32767
################################################################################
# Swap File Chunked
@@ -73,10 +74,10 @@ swapfu_prio=-1024
swapfc_enabled=0
swapfc_frequency=1s # How often check free swap space
swapfc_chunk_size=256M # Allocate size of swap chunk
-swapfc_max_count=16 # 0 - unlimited
+swapfc_max_count=16 # 0 - unlimited, note: 32 is a kernel maximum
swapfc_free_swap_perc=15 # Add new chunk if free < 15%
# Remove chunk if free > 15+40% & chunk count > 2
-swapfc_path=/var/.swapfc/
+swapfc_path=/var/lib/systemd-swap/swapfc/
################################################################################
# Swap devices
--
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