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=-2.2 required=3.0 tests=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 1FB03C2D0C0 for ; Mon, 23 Dec 2019 17:23:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0501C2073A for ; Mon, 23 Dec 2019 17:23:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727014AbfLWRX2 (ORCPT ); Mon, 23 Dec 2019 12:23:28 -0500 Received: from outgoing-auth-1.mit.edu ([18.9.28.11]:37371 "EHLO outgoing.mit.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726840AbfLWRX2 (ORCPT ); Mon, 23 Dec 2019 12:23:28 -0500 Received: from callcc.thunk.org (guestnat-104-133-0-111.corp.google.com [104.133.0.111] (may be forged)) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id xBNHMvOs026152 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 23 Dec 2019 12:22:58 -0500 Received: by callcc.thunk.org (Postfix, from userid 15806) id 94F14420822; Mon, 23 Dec 2019 12:22:57 -0500 (EST) Date: Mon, 23 Dec 2019 12:22:57 -0500 From: "Theodore Y. Ts'o" To: Andrea Vai Cc: Ming Lei , "Schmid, Carsten" , Finn Thain , 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 , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: AW: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 Message-ID: <20191223172257.GB3282@mit.edu> References: <20191211024137.GB61323@mit.edu> <20191211040058.GC6864@ming.t460p> <20191211160745.GA129186@mit.edu> <20191211213316.GA14983@ming.t460p> <20191218094830.GB30602@ming.t460p> <20191223130828.GA25948@ming.t460p> <20191223162619.GA3282@mit.edu> <4c85fd3f2ec58694cc1ff7ab5c88d6e11ab6efec.camel@unipv.it> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4c85fd3f2ec58694cc1ff7ab5c88d6e11ab6efec.camel@unipv.it> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Mon, Dec 23, 2019 at 05:29:27PM +0100, Andrea Vai wrote: > I run the cp command from a bash script, or from a bash shell. I don't > know if this answer your question, otherwise feel free to tell me a > way to find the answer to give you. What distro are you using, and/or what package is the cp command coming from, and what is the package name and version? Also, can you remind me what the bash script is and how many files you are copying? Can you change the script so that the cp command is prefixed by: "strace -tTf -o /tmp/st " e.g., strace -tTf -o /tmp/st cp And then send me the /tmp/st file. This will significantly change the time, so don't do this for measuring performance. I just want to see what the /bin/cp command is *doing*. - Ted