Thu, 06 Jul 2017 20:39:31 +0300 Manfred Hollstein
On Thu, 06 Jul 2017, 19:24:37 +0200, Andrei Borzenkov wrote:
06.07.2017 16:41, Takashi Iwai пишет:
On Tue, 04 Jul 2017 22:28:23 +0200, Dmitriy A. Perlow wrote:
Hello.
Is BFQ enabled for kernel builds? I tried elevator=bfq with 4.12.rc7 and got all partitions unmountable.
On 4.12, BFQ is available as multi-queue I/O scheduler, so it's a two step enablement:
- Pass scsi.use_blk_mq=1 boot option to switch to SCSI MQ.
- Choose bfq in /sys/block/sd*/queue/scheduler file, e.g. # echo bfq > /sys/block/sda/queue/scheduler
The latter can be automated via udev, tmpfiles.d or whatever, too.
Can it be set as global default for all devices?
Sure, just add the following to your bootloader's command line:
scsi.use_blk_mq=1 elevator=bfq
elevator=bfq seems not to work for some reason…
The "elevator=..." thing remains the same as it used to work for quite some time now.
HTH, cheers.
l8er manfred
-- Best regards, Dmitriy Perlow -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org