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From: "Holger Hoffstätte" <holger@applied-asynchrony.com>
To: linux-block <linux-block@vger.kernel.org>
Subject: wbt_lat_usec still set despite wbt disabled by BFQ
Date: Wed, 17 Aug 2022 19:12:12 +0200	[thread overview]
Message-ID: <a5041479-f417-2b95-b645-56e665a7e557@applied-asynchrony.com> (raw)


I just noticed that my device configured with BFQ still shows wbt_lat_usec
as configured, despite the fact that BFQ disables WBT in bfq_init_queue [1]:

$cat /sys/block/sdc/queue/scheduler
mq-deadline [bfq] none
$cat /sys/block/sdc/queue/wbt_lat_usec
75000

Is this supposed to be 0 (since it's disabled) or is sysfs confused?

Thanks,
Holger

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/block/bfq-iosched.c#n7195


             reply	other threads:[~2022-08-17 17:12 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-17 17:12 Holger Hoffstätte [this message]
2022-09-13 13:39 ` wbt_lat_usec still set despite wbt disabled by BFQ Yu Kuai
2022-09-13 14:12   ` Holger Hoffstätte
2022-09-13 14:20     ` Yu Kuai
2022-09-13 16:13       ` Holger Hoffstätte
2022-09-14  1:35         ` Yu Kuai
2022-09-14  6:05           ` Holger Hoffstätte
2022-09-14  9:23             ` Yu Kuai

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