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    SubjectRe: [PATCHSET v5 0/12] Add support for async buffered reads
    > Time to experience with ZRAM :-).

    I switched over from swap-file to zramswap.

    And I can definitely say, my last kernel w/o your patchset does not
    show the symptoms.

    # cat systemd-analyze-time_5.7.0-rc7-2-amd64-clang_2nd-try.txt
    Startup finished in 6.129s (kernel) + 44.192s (userspace) = 50.322s
    graphical.target reached after 44.168s in userspace

    # cat systemd-analyze-blame_5.7.0-rc7-2-amd64-clang_2nd-try.txt
    24.050s udisks2.service
    23.711s accounts-daemon.service
    18.615s dev-sdc2.device
    17.119s polkit.service
    16.980s avahi-daemon.service
    16.879s NetworkManager.service
    16.112s rtkit-daemon.service
    15.126s switcheroo-control.service
    15.117s wpa_supplicant.service
    15.105s systemd-logind.service
    14.475s NetworkManager-wait-online.service
    14.258s smartmontools.service
    13.161s zramswap.service
    9.522s rsyslog.service
    8.337s gpm.service
    6.026s packagekit.service
    5.871s ModemManager.service
    5.746s networking.service
    5.383s e2scrub_reap.service
    3.960s systemd-udevd.service
    3.396s apparmor.service
    3.231s exim4.service
    2.795s systemd-journal-flush.service
    2.359s alsa-restore.service
    2.186s systemd-rfkill.service
    1.878s atd.service
    1.164s keyboard-setup.service
    1.098s bluetooth.service
    1.089s systemd-tmpfiles-setup.service
    1.021s pppd-dns.service
    968ms systemd-backlight@backlight:intel_backlight.service
    964ms upower.service
    937ms binfmt-support.service
    873ms systemd-modules-load.service
    849ms systemd-sysusers.service
    845ms systemd-journald.service
    683ms systemd-timesyncd.service
    676ms modprobe@drm.service
    641ms systemd-udev-trigger.service
    620ms dev-hugepages.mount
    618ms dev-mqueue.mount
    618ms sys-kernel-debug.mount
    617ms sys-kernel-tracing.mount
    501ms ifupdown-wait-online.service
    434ms systemd-sysctl.service
    419ms systemd-random-seed.service
    413ms systemd-tmpfiles-setup-dev.service
    405ms user@1000.service
    389ms systemd-remount-fs.service
    383ms console-setup.service
    301ms kmod-static-nodes.service
    181ms proc-sys-fs-binfmt_misc.mount
    174ms systemd-update-utmp.service
    85ms systemd-user-sessions.service
    22ms user-runtime-dir@1000.service
    19ms systemd-update-utmp-runlevel.service
    5ms ifupdown-pre.service
    4ms sys-fs-fuse-connections.mount

    [ /etc/zramswap.conf ]

    ZRAM_SIZE_PERCENT=20
    # ZSTD support for ZRAM and ZSWAP requires Linux >= 5.7-rc+. -dileks
    ZRAM_COMPRESSION_ALGO=zstd

    [ /etc/fstab ]

    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> || <mount point> || <type> || <options> || <dump> || <pass>
    #
    # Root-FS (here: /dev/sdc2)
    UUID=<myUUID> / ext4 errors=remount-ro 0 1
    # SWAP (here: /dev/zram0)
    # Zram-based swap (compressed RAM block devices), for details see
    zramswap.service and zramswap.conf

    # dmesg | egrep 'zram|zswap'
    [ 1.041958] zswap: loaded using pool zstd/zbud
    [ 29.569355] zram: Added device: zram0
    [ 29.581631] zram0: detected capacity change from 0 to 1647824896
    [ 30.562279] Adding 1609200k swap on /dev/zram0. Priority:100
    extents:1 across:1609200k SSFS

    # cat /sys/devices/virtual/block/zram0/comp_algorithm
    lzo lzo-rle lz4 lz4hc [zstd]

    # swapon --show
    NAME TYPE SIZE USED PRIO
    /dev/zram0 partition 1,5G 0B 100

    # cat /proc/swaps
    Filename Type Size Used Priority
    /dev/zram0 partition 1609200 0 100

    If you have any ideas let me know.

    Ah, I see there is async-buffered.6.

    - Sedat -

    [1] https://aur.archlinux.org/packages/zramswap/
    [2] https://aur.archlinux.org/cgit/aur.git/tree/zramswap.conf?h=zramswap
    [3] https://aur.archlinux.org/cgit/aur.git/tree/zramswap.service?h=zramswap

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