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Date:   Sun, 31 May 2020 09:04:13 +0200
From:   Sedat Dilek <>
To:     Jens Axboe <>
Subject: Re: [PATCHSET v5 0/12] Add support for async buffered reads

On Sun, May 31, 2020 at 3:57 AM Jens Axboe <> wrote:
> On 5/30/20 12:57 PM, Sedat Dilek wrote:
> > Here are the numbers with your patchset:
> >
> > # cat systemd-analyze-time_5.7.0-rc7-4-amd64-clang_2nd-try.txt
> > Startup finished in 7.229s (kernel) + 1min 18.304s (userspace) = 1min 25.534s
> > reached after 1min 18.286s in userspace
> Can you see if this makes a difference?
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index c296463c15eb..ccb895f911b1 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -374,8 +374,7 @@ enum req_flag_bits {
>  #define REQ_INTEGRITY          (1ULL << __REQ_INTEGRITY)
>  #define REQ_FUA                        (1ULL << __REQ_FUA)
>  #define REQ_PREFLUSH           (1ULL << __REQ_PREFLUSH)
> -#define REQ_RAHEAD             \
> -       ((1ULL << __REQ_RAHEAD) | (1ULL << __REQ_NOWAIT))
> +#define REQ_RAHEAD             (1ULL << __REQ_RAHEAD)
>  #define REQ_BACKGROUND         (1ULL << __REQ_BACKGROUND)
>  #define REQ_NOWAIT             (1ULL << __REQ_NOWAIT)
>  #define REQ_CGROUP_PUNT                (1ULL << __REQ_CGROUP_PUNT)

Looks good!

With your patch I now get...

# cat systemd-analyze-time_5.7.0-rc7-6-amd64-clang.txt
Startup finished in 6.199s (kernel) + 45.143s (userspace) = 51.343s reached after 45.123s in userspace

# cat systemd-analyze-blame_5.7.0-rc7-6-amd64-clang.txt
25.029s udisks2.service
24.582s accounts-daemon.service
19.257s dev-sdc2.device
18.016s polkit.service
17.857s avahi-daemon.service
17.730s NetworkManager.service
17.433s rtkit-daemon.service
16.558s switcheroo-control.service
16.547s wpa_supplicant.service
16.538s systemd-logind.service
16.078s smartmontools.service
14.982s fwupd-refresh.service
14.580s NetworkManager-wait-online.service
13.630s zramswap.service
11.286s fwupd.service
 8.153s rsyslog.service
 6.858s gpm.service
 6.835s e2scrub_reap.service
 6.449s ModemManager.service
 6.439s networking.service
 5.881s packagekit.service
 3.696s systemd-udevd.service
 3.322s apparmor.service
 3.277s exim4.service
 2.910s alsa-restore.service
 1.611s systemd-tmpfiles-setup.service
 1.540s bluetooth.service
 1.448s systemd-journal-flush.service
 1.353s keyboard-setup.service
 1.322s atd.service
 1.239s systemd-modules-load.service
 1.216s binfmt-support.service
 1.060s modprobe@....service
  994ms systemd-journald.service
  983ms upower.service
  937ms systemd-sysusers.service
  914ms ifupdown-wait-online.service
  904ms pppd-dns.service
  710ms systemd-udev-trigger.service
  666ms dev-hugepages.mount
  650ms dev-mqueue.mount
  649ms sys-kernel-debug.mount
  647ms sys-kernel-tracing.mount
  607ms console-setup.service
  590ms systemd-tmpfiles-setup-dev.service
  570ms systemd-timesyncd.service
  508ms systemd-random-seed.service
  461ms systemd-backlight@...klight:intel_backlight.service
  433ms user@...0.service
  422ms systemd-remount-fs.service
  365ms systemd-sysctl.service
  279ms kmod-static-nodes.service
  246ms proc-sys-fs-binfmt_misc.mount
  202ms systemd-rfkill.service
  130ms systemd-user-sessions.service
  104ms systemd-update-utmp.service
   25ms user-runtime-dir@...0.service
   14ms systemd-update-utmp-runlevel.service
    6ms sys-fs-fuse-connections.mount
    4ms ifupdown-pre.service

# cat systemd-analyze-critical-chain_5.7.0-rc7-6-amd64-clang.txt
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character. @45.123s
└─ @45.122s
  └─exim4.service @41.842s +3.277s
    └─ @41.840s
      └─NetworkManager-wait-online.service @27.259s +14.580s
        └─NetworkManager.service @9.522s +17.730s
          └─dbus.service @9.514s
            └─ @9.328s
              └─ @9.327s
                └─dbus.socket @9.327s
                  └─ @9.202s

└─systemd-backlight@...klight:intel_backlight.service @21.927s +461ms
                      └─system-systemd\x2dbacklight.slice @21.925s
                        └─system.slice @2.529s
                          └─-.slice @2.529s

Will you send a separate patch on this?

Feel free to add:
Reported-by: Sedat Dilek <>
Tested-by: Sedat Dilek <>

My kernel-config and dmesg-output are attached.

Thanks Jens!

- Sedat -

View attachment "dmesg-T-5.7.0-rc7-6-amd64-clang.txt" of type "text/plain" (71185 bytes)

Download attachment "config-5.7.0-rc7-6-amd64-clang" of type "application/octet-stream" (229548 bytes)

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