From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AAB55C25B08 for ; Wed, 17 Aug 2022 17:12:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237222AbiHQRMQ (ORCPT ); Wed, 17 Aug 2022 13:12:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237040AbiHQRMQ (ORCPT ); Wed, 17 Aug 2022 13:12:16 -0400 X-Greylist: delayed 26357 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Wed, 17 Aug 2022 10:12:14 PDT Received: from mail.itouring.de (mail.itouring.de [85.10.202.141]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83B89642F3 for ; Wed, 17 Aug 2022 10:12:14 -0700 (PDT) Received: from tux.applied-asynchrony.com (p5ddd78be.dip0.t-ipconnect.de [93.221.120.190]) by mail.itouring.de (Postfix) with ESMTPSA id 9ABF0103762 for ; Wed, 17 Aug 2022 19:12:12 +0200 (CEST) Received: from [192.168.100.221] (hho.applied-asynchrony.com [192.168.100.221]) by tux.applied-asynchrony.com (Postfix) with ESMTP id 5372CF01600 for ; Wed, 17 Aug 2022 19:12:12 +0200 (CEST) To: linux-block From: =?UTF-8?Q?Holger_Hoffst=c3=a4tte?= Subject: wbt_lat_usec still set despite wbt disabled by BFQ Organization: Applied Asynchrony, Inc. Message-ID: Date: Wed, 17 Aug 2022 19:12:12 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org 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