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 X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F18C2C432C0 for ; Sat, 23 Nov 2019 07:28:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B6F1B2068F for ; Sat, 23 Nov 2019 07:28:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Hw7ATIl7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726686AbfKWH2p (ORCPT ); Sat, 23 Nov 2019 02:28:45 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:39036 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725800AbfKWH2p (ORCPT ); Sat, 23 Nov 2019 02:28:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574494124; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0VpnZxogNfmq2zNOxOpvLIFykqFG115bnmJucwdOn3c=; b=Hw7ATIl79D+5HDUKbY622mwKXiC7i4wkPxvkLAo8D120Xjde+Dduohk4zpFhq7UzGldH6b wE8Fq8XEvKQBAAD4Cl7Wt+hyVfR1IQ70ZsKCfw802FvCERe1gG+oI2l6Yeu0C9XYTUeMGu QN0+AHjkyds2HmoV/OTym+qp5l+As6g= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-177-sWOOPYRKPNKL7Lq1o5RkHg-1; Sat, 23 Nov 2019 02:28:40 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7E2DA1800D40; Sat, 23 Nov 2019 07:28:37 +0000 (UTC) Received: from ming.t460p (ovpn-8-17.pek2.redhat.com [10.72.8.17]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 38DDE10013A1; Sat, 23 Nov 2019 07:28:24 +0000 (UTC) Date: Sat, 23 Nov 2019 15:28:20 +0800 From: Ming Lei To: Andrea Vai Cc: Damien Le Moal , Alan Stern , Jens Axboe , Johannes Thumshirn , USB list , SCSI development list , Himanshu Madhani , Hannes Reinecke , Omar Sandoval , "Martin K. Petersen" , Greg KH , Hans Holmberg , Kernel development list Subject: Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 Message-ID: <20191123072726.GC25356@ming.t460p> References: <20191109222828.GA30568@ming.t460p> MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: sWOOPYRKPNKL7Lq1o5RkHg-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 22, 2019 at 08:16:30PM +0100, Andrea Vai wrote: > Il giorno dom, 10/11/2019 alle 06.28 +0800, Ming Lei ha scritto: > > Another thing we could try is to use 'none' via the following > > command: > >=20 > > echo none > /sys/block/sdh/queue/scheduler #suppose 'sdh' points > > to the usb storage disk > >=20 > > Because USB storage HBA is single hw queue, which depth is 1. This > > way > > should change to dispatch IO in the order of bio submission. > >=20 > > Andrea, could you switch io scheduler to none and update us if > > difference > > can be made? >=20 > Using the new kernel, there is indeed a difference because the time to > copy a file is 1800 seconds with [mq-deadline], and 340 seconds with > [none]. But that is still far away from the old kernel, which performs > the copy of the same file in 76 seconds. Please post the log of 'lsusb -v', and I will try to make a patch for addressing the issue. thanks,=20 Ming