24.07.2015 12:35, Wolfgang M. Reimer пишет:
On 22.07.2015 22:05, Pavel Vasilyev wrote:
# 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
# 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"
# cat /sys/block/sda/queue/scheduler
none
# cat /sys/block/sda/queue/scheduler
noop [deadline] cfq
# 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
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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