143 lines
5.5 KiB
Plaintext
143 lines
5.5 KiB
Plaintext
# zram settings...
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# SPDX-License-Identifier: GPL-2.0-only
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# load zram kernel module on start?
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load_on_start=yes
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# unload zram kernel module on stop?
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unload_on_stop=yes
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# Number of devices.
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# This value is also passed to the kernel module on modprobe.
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num_devices=2
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# For each device, specify the following variables
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# Omitting them is the same as specifying them as empty: It uses defaults
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# type0, type1, ... are the variables for the types (see below)
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# size0, size1, ... are the variables for the sizes (in MB)
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# mlim0, mlim1, ... are the variables for the maximal uncompressed memory (MB)
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# back0, back1, ... are the variables for the backup device (paths)
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# icmp0, icmp1, ... are the flags (nonempty = true) whether incompressible
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# pages are written to the backup device (requires back*)
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# idle0, idle1, ... are the flags (nonempty = true) whether idle pages are
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# written to the backup device (requires back*)
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# wlim0, wlim1, ... set the writeback_limit for idle pages (implies idle*)
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# algo0, algo1, ... are the variables for the compression algorithms
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# para0, para1, ... are the variables for the algorithm parameters
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# flag0, flag1, ... are the variables for the flags
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# labl0, labl1, ... are the variables for the label name (if you want some)
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# uuid0, uuid1, ... are the variables for the UUID (if you want to force it)
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# args0, args1, ... are the variables for additional arguments to zram-init
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# (args0, args1, ... are eval'd, so quote correspondingly!)
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# notr0, notr1, ... are the flags (nonempty = true) for "do not trim (discard)"
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# (set notr* to a nonempty value only for linux-3.14 or earlier or when you
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# are prepared to waste a lot of memory for a possibly slight speed increase)
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#
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# The following are ignored for type swap but not for the other types:
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# blck0, blck1, ... are the variables for the blocksize (ext2, ext4)
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# irat0, irat1, ... are the variables for the byte/inode ratio (ext2, ext4)
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# inod0, inod1, ... are the variables for the inode number (ext2, ext4)
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# opts0, opts1, ... are the variables for the mount options
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# mode0, mode1, ... are the variables for the directory mode
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# owgr0, owgr1, ... are the variables for the directory owner:group
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#
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# If the size is 0 (or empty) the device is ignored by the script.
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#
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# Available types:
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# "swap" The device is initialized as a swap device.
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# The flags variable specifies the priority (16383 if empty).
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# Use "-" in the flags variable for the default priority (-1)
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# "/..." The device is mounted on /...
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# The flags variable specifies the type (ext2, ext4, btrfs, or xfs;
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# default is ext4)
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# "-" The filesystem (specified by flags as above) is created in
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# /dev/zram$NUM but not mounted
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# Devices with other types are ignored by the script
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#
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# Only variables with numbers 0 ... num_devices-1 are used by the script.
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# swap - 500M (or a fourth of available memory if uncommenting)
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type0=swap
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flag0= # The default "16383" is fine for us
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size0=512
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#size0=`LC_ALL=C free -m | awk '/^Mem:/{print int($2/4)}'`
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mlim0= # no hard memory limit
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back0= # no backup device
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icmp0= # no incompressible page writing to backup device
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idle0= # no idle page writing to backup device
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wlim0= # no writeback_limit for idle page writing for backup device
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notr0= # keep the default on linux-3.15 or newer
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algo0=zstd # zstd (since linux-4.18), lz4 (since linux-3.15), or lzo.
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# Size: zstd (best) > lzo > lz4. Speed: lz4 (best) > zstd > lzo
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para0= # No algorithm parameters
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labl0=zram_swap # the label name
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uuid0= # Do not force UUID
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args0= # we could e.g. have set args0="-L 'zram_swap'" instead of using labl0
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# /tmp - 2G
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# If you use this, you should put zram-init into the boot runlevel,
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# and services using /tmp should be in the default runlevel and/or have
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# rc_need=zram-init in their /etc/conf.d/... file
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type1=/tmp
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flag1=ext4
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size1=2048
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mlim1= # no hard memory limit
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back1= # no backup device
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icmp1= # no incompressible page writing to backup device
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idle1= # no idle page writing to backup device
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wlim1= # no writeback_limit for idle page writing for backup device
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blck1=1024 # the default blocksize of 4096
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irat1= # bytes/inode ratio
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inod1= # inode number
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opts1="strictatime,nosuid,nodev,noexec" # e.g. "relatime" or "noatime" are also reasonable choices
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mode1=1777
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owgr1= # No reason to change the default "root:root"
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notr1= # keep the default on linux-3.15 or newer
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algo1=zstd
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para1="level=3" # algorithm-specific parameters such as compression level
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labl1=tmp_dir
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uuid1=
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args1=
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# /var/tmp - 1G
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type2=/var/tmp
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flag2=ext2
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size2=1024
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mlim2= # no hard memory limit
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back2= # no backup device
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icmp2= # no incompressible page writing to backup device
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idle2= # no idle page writing to backup device
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wlim2= # no writeback_limit for idle page writing for backup device
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blck2= # the default blocksize is 4096
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irat2= # bytes/inode ratio
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inod2= # inode number
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opts2=relatime # e.g. "noatime" or "strictatime" are also reasonable choices
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mode2=1777
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owgr2= # No reason to change the default "root:root"
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notr2= # keep the default on linux-3.15 or newer
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algo2=zstd
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para2= # No algorithm parameters
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labl2=var_tmp_dir
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uuid2=
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args2=
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# Artificial example with btrfs
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# (Not actually used here: variables are overridden afterwards by other values)
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type3=- # Only format the filesystem but actually do not mount it
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flag3=btrfs
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size3=1024
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algo3=zstd
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labl3=zbtrfs
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uuid3=
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args3=
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# swap - 500M
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# The following is not used by the default (num_devices=3).
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type3=swap
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flag3=
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size3=512
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algo3=zstd
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labl3=zram_swap2
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uuid3=
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args3=
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