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Where IOSCHED ?

DISCUSSION Pavel Vasilyev 3 participants 6 messages Jul 22, 2015 – Jul 25, 2015

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Pavel Vasilyev

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#0 lore raw
# dmesg | grep sched
[    0.387902] io scheduler noop registered
[    0.387989] io scheduler deadline registered
[    0.388079] io scheduler cfq registered (default)
# cat /boot/config-3.18.17-rt14 | grep IOSCHED
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_CFQ_GROUP_IOSCHED=y
CONFIG_DEFAULT_IOSCHED="cfq"
# cat /sys/block/sda/queue/scheduler
none
# uname -a
Linux localhost 3.18.17-rt14 #1 SMP PREEMPT RT Wed Jul 22 18:49:51 MSK 2015 x86_64 GNU/Linux
Signature · 1 line
                                                         Pavel.
#1 lore raw
Quoted 3 lines · * Pavel Vasilyev | 2015-07-22 23:05:24 [+0300]:
[    0.388079] io scheduler cfq registered (default)
# cat /sys/block/sda/queue/scheduler
none

Does the same thing happen with plain v3.18.17? Because if it does then it is not a -RT problem.

Quoted 3 lines
# uname -a
Linux localhost 3.18.17-rt14 #1 SMP PREEMPT RT Wed Jul 22 18:49:51
MSK 2015 x86_64 GNU/Linux

Sebastian

author
#2 lore raw

23.07.2015 15:39, Sebastian Andrzej Siewior пишет:

Quoted 7 lines · * Pavel Vasilyev | 2015-07-22 23:05:24 [+0300]:
Quoted 4 lines
[    0.388079] io scheduler cfq registered (default)
# cat /sys/block/sda/queue/scheduler
none

Does the same thing happen with plain v3.18.17? Because if it does then it is not a -RT problem.

This production server, but i try compile plain kernel :)

Quoted 5 lines
Quoted 4 lines
# uname -a
Linux localhost 3.18.17-rt14 #1 SMP PREEMPT RT Wed Jul 22 18:49:51
MSK 2015 x86_64 GNU/Linux

Sebastian

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author
#3 lore raw
In reply to Sebastian Andrzej Siewior

23.07.2015 15:39, Sebastian Andrzej Siewior пишет:

Quoted 6 lines · * Pavel Vasilyev | 2015-07-22 23:05:24 [+0300]:
Quoted 3 lines
[    0.388079] io scheduler cfq registered (default)
# cat /sys/block/sda/queue/scheduler
none

Does the same thing happen with plain v3.18.17? Because if it does then it is not a -RT problem.

# gzip -cd ../patch-3.18.17-rt14.patch.gz | patch -p1 -R;
#  make oldconfig; make; make install; make modules_install; reboot;
...
# cat /sys/block/{sd,md}*/queue/scheduler
none
none
none
none
none
none

Ooops o.0

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#4 lore raw
In reply to Pavel Vasilyev
Quoted 5 lines · Pavel Vasilyev
# dmesg | grep sched
[    0.387902] io scheduler noop registered
[    0.387989] io scheduler deadline registered
[    0.388079] io scheduler cfq registered (default)
# dmesg | grep sched
[    0.516085] io scheduler noop registered
[    0.516089] io scheduler deadline registered (default)
[    0.516096] io scheduler cfq registered
Quoted 7 lines
# cat /boot/config-3.18.17-rt14 | grep IOSCHED
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_CFQ_GROUP_IOSCHED=y
CONFIG_DEFAULT_IOSCHED="cfq"
# cat /boot/config-3.18.17-rt14 | grep IOSCHED
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_CFQ_GROUP_IOSCHED=y
CONFIG_DEFAULT_IOSCHED="deadline"
Quoted 3 lines
# cat /sys/block/sda/queue/scheduler
none
# cat /sys/block/sda/queue/scheduler
noop [deadline] cfq
Quoted 2 lines
# uname -a
Linux localhost 3.18.17-rt14 #1 SMP PREEMPT RT Wed Jul 22 18:49:51 MSK 2015 x86_64 GNU/Linux
# uname -a
Linux t520-wolf 3.18.17-rt14 #1 SMP PREEMPT RT Tue Jul 7 14:23:12 CEST 2015 x86_64 x86_64 x86_64 GNU/Linux

Hi Pavel,

so in my case /sys/block/sda/queue/scheduler shows the correct I/O schedulers for the *same* kernel (3.18.17-rt14). The only difference is that my default I/O scheduler is "deadline".

Wolfgang

author
#5 lore raw

24.07.2015 12:35, Wolfgang M. Reimer пишет:

Quoted 39 lines · Pavel Vasilyev
Quoted 6 lines
# dmesg | grep sched
[    0.387902] io scheduler noop registered
[    0.387989] io scheduler deadline registered
[    0.388079] io scheduler cfq registered (default)
# dmesg | grep sched
[    0.516085] io scheduler noop registered
[    0.516089] io scheduler deadline registered (default)
[    0.516096] io scheduler cfq registered
Quoted 7 lines
# cat /boot/config-3.18.17-rt14 | grep IOSCHED
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_CFQ_GROUP_IOSCHED=y
CONFIG_DEFAULT_IOSCHED="cfq"
# cat /boot/config-3.18.17-rt14 | grep IOSCHED
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_CFQ_GROUP_IOSCHED=y
CONFIG_DEFAULT_IOSCHED="deadline"
Quoted 3 lines
# cat /sys/block/sda/queue/scheduler
none
# cat /sys/block/sda/queue/scheduler
noop [deadline] cfq
Quoted 2 lines
# uname -a
Linux localhost 3.18.17-rt14 #1 SMP PREEMPT RT Wed Jul 22 18:49:51 MSK 2015 x86_64 GNU/Linux
# uname -a
Linux t520-wolf 3.18.17-rt14 #1 SMP PREEMPT RT Tue Jul 7 14:23:12 CEST 2015 x86_64 x86_64 x86_64 GNU/Linux
Quoted 8 lines

Hi Pavel,

so in my case /sys/block/sda/queue/scheduler shows the correct I/O schedulers for the *same* kernel (3.18.17-rt14). The only difference is that my default I/O scheduler is "deadline".

Wolfgang

Maybe my mistake, but I use a Soft RAID1

$ cat /sys/block/{sd,md}*/queue/scheduler
none
none
none
none
none
none

--

Other server (Debian 6.0.10): non RT, but with soft RAID1 too.

$ uname -a
Linux mail 2.6.32-5-amd64 #1 SMP Wed Jun 17 16:09:06 UTC 2015 x86_64 GNU/Linux
$ cat /sys/block/{sd,md}*/queue/scheduler

noop anticipatory deadline [cfq]
noop anticipatory deadline [cfq]
none
none
none

here: sda,sdb,md0,md1,md2,md3

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