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=-2.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, T_DKIMWL_WL_HIGH,USER_AGENT_MUTT autolearn=ham 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 717A2C28CC5 for ; Wed, 5 Jun 2019 14:55:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C527206B8 for ; Wed, 5 Jun 2019 14:55:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559746530; bh=LRZ30IPa6Nv2lRdKaHOKDLX7XyAGFKonVvxxNwqLT8E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=vK/CALbF53zSSI/7gelIvebN3+qsj4A9+Ns5Y+IpA99pUhiHce8qE9bog/yrBxb3Z oD4GtO11SGDf026JCTw5Sa5aDOj/4qWGIMNwYV8sEUfWloUDek085sl4NKFLSw34NJ e6lz9+u48H2x6jZWTLzb5fj5fsHFMRwS+4o2FOZc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728502AbfFEOz3 (ORCPT ); Wed, 5 Jun 2019 10:55:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:55014 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728303AbfFEOz3 (ORCPT ); Wed, 5 Jun 2019 10:55:29 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3FF5A206B8; Wed, 5 Jun 2019 14:55:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559746528; bh=LRZ30IPa6Nv2lRdKaHOKDLX7XyAGFKonVvxxNwqLT8E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LZjO9Ux7yVL3s4+u/DYaZJ071X99d49oJqAwPpf1DIP7AEvq3kIhoclG36/XlpMR/ N0JPdQobFdyr3K8aMQ74zoGuG3XXzIlRA2lKp2BQ9YIEFoelZuokv4i1Ul20HwVba5 o7egZ5ZQUqoXV0byy4oo7jIBhRDZolbkqPP3nojE= Date: Wed, 5 Jun 2019 16:55:25 +0200 From: Greg KH To: Andrea Vai Cc: linux-usb@vger.kernel.org Subject: Re: Slow I/O on USB media Message-ID: <20190605145525.GA28819@kroah.com> References: <2a9e1be71a2c6c940dac904752fdd34129745444.camel@unipv.it> <20190530132522.GA21005@kroah.com> <86676f40a8c1aa44bf5799eac6019183d6d33336.camel@unipv.it> <20190604054300.GE1588@kroah.com> <9b013238be4e3c63e33181a954d1ecc3287d22e4.camel@unipv.it> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9b013238be4e3c63e33181a954d1ecc3287d22e4.camel@unipv.it> User-Agent: Mutt/1.12.0 (2019-05-25) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Wed, Jun 05, 2019 at 09:36:04AM +0200, Andrea Vai wrote: > Hi, > Il giorno mar, 04/06/2019 alle 07.43 +0200, Greg KH ha scritto: > > On Mon, Jun 03, 2019 at 01:13:48PM +0200, Andrea Vai wrote: > > > Il giorno gio, 30/05/2019 alle 06.25 -0700, Greg KH ha scritto: > > > > [...] > > > Hi, > > > > > > > Any chance you can use 'git bisect' to find the offending > > commit? > > > Yes, I am doing it as I managed to build the kernel from source > > > > Great! What did you find? > > # first bad commit: [534903d60376b4989b76ec445630aa10f2bc3043] > drm/atomic: Use explicit old crtc state in > drm_atomic_add_affected_planes() > > By the way, as I am not expert, is there a way to double-check that I > bisected correctly? (such as, e.g., test with the version before this > one, and then with this commit applied?) How exactly are you "testing" this? I would recommend a script that does something like: mount the disk somewhere copy a big file to it unmount the disk testing how long the whole process takes, especially the 'unmount' is important. Are you doing that? Also, you should probably just boot into text mode for this, most graphical DEs like to auto-mount disks these days. thanks, greg k-h