linux-kernel - Re: [PATCHSET v5 0/12] Add support for async buffered reads

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Date:   Fri, 29 May 2020 13:22:36 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     io-uring@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: Re: [PATCHSET v5 0/12] Add support for async buffered reads

On Fri, May 29, 2020 at 12:02 PM Sedat Dilek <sedat.dilek@...il.com> wrote:

[ ... ]

> As I saw stallings with e2scrub_reap.service and swap partition
> (partly seen in the boot-process and noted the UUID 3f8e).
> I disabled e2scrub_reap.service and deactivated swap partition in /etc/fstab.
>

I switched over from using a swap-partition to a swap-file.

The boot-slowdown is "gone" in sense of 1m30s stalls or better in
sense of boot-time is shorter.

# cat systemd-analyze-time.txt
Startup finished in 6.903s (kernel) + 1min 13.501s (userspace) = 1min 20.404s
graphical.target reached after 1min 13.481s in userspace

# cat systemd-analyze-time_swapfile.txt
Startup finished in 6.721s (kernel) + 1min 9.470s (userspace) = 1min 16.192s
graphical.target reached after 1min 9.451s in userspace

# cat systemd-analyze-blame.txt | head -20
35.943s udisks2.service
32.559s accounts-daemon.service
27.925s smartmontools.service
26.561s NetworkManager.service
24.543s dev-sdc2.device
24.478s polkit.service
20.426s NetworkManager-wait-online.service
19.785s avahi-daemon.service
19.586s switcheroo-control.service
19.185s rtkit-daemon.service
18.661s wpa_supplicant.service
18.269s systemd-logind.service
17.627s rsyslog.service
16.312s gpm.service
14.842s e2scrub_reap.service
14.387s packagekit.service
12.017s ModemManager.service
10.584s alsa-restore.service
 8.407s atd.service
 6.025s exim4.service

# cat systemd-analyze-blame_swapfile.txt | head -20
29.571s udisks2.service
26.383s accounts-daemon.service
24.564s smartmontools.service
20.735s NetworkManager.service
19.254s NetworkManager-wait-online.service
18.675s polkit.service
15.523s dev-sdc2.device
14.152s avahi-daemon.service
14.006s switcheroo-control.service
13.800s rtkit-daemon.service
13.662s packagekit.service
13.353s wpa_supplicant.service
13.178s rsyslog.service
12.788s systemd-logind.service
12.313s e2scrub_reap.service
11.105s ModemManager.service
11.003s gpm.service
10.018s networking.service
 6.608s apparmor.service
 5.858s exim4.service

Thanks.

Time to experience with ZRAM :-).

- Sedat -

LINK: https://wiki.debian.org/Swap
LINK: https://help.ubuntu.com/community/SwapFaq

mount -t auto /dev/sdb1 /mnt/sandisk

fallocate -l 8g /mnt/sandisk/swapfile

8 x 1024 x 1024 = 8388608

dd if=/dev/zero bs=1024 count=8388608 of=/mnt/sandisk/swapfile
8388608+0 Datensätze ein
8388608+0 Datensätze aus
8589934592 bytes (8,6 GB, 8,0 GiB) copied, 176,511 s, 48,7 MB/s

# chmod 600 /mnt/sandisk/swapfile

# ll /mnt/sandisk/swapfile
-rw------- 1 root root 8,0G Mai 29 12:23 /mnt/sandisk/swapfile

# mkswap /mnt/sandisk/swapfile
Setting up swapspace version 1, size = 8 GiB (8589930496 bytes)
no label, UUID=d3b72e81-c0fc-49fa-9704-cbbaba3822fc

# swapon /mnt/sandisk/swapfile

# free -h
              total        used        free      shared  buff/cache   available
Mem:          7,7Gi       1,6Gi       4,8Gi       167Mi       1,3Gi       5,7Gi
Swap:         8,0Gi          0B       8,0Gi

- EOT -