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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 73C62C49ED7 for ; Fri, 20 Sep 2019 07:44:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45E2A208C0 for ; Fri, 20 Sep 2019 07:44:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568965483; bh=awK4sAwt/JjMC+qdomldJWdCvOM2PA4r6OZQgPo1DqI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=bWDh8PwiiUpiwDvfFS3iw+Qw6oHTii3+nIiA9/h0HGESRDLUnKLG/zQfKgjmcqxoH FFo7oiCXwLcl8MEBqQgOJZVKmkHEn7QjdRCk5h/CObecjLaGBpe4zsbnIoShQEDofS 4R/YM/0Z+5RfGcKwIoaILXgFmuSpqhrjJjbfDU+0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404821AbfITHom (ORCPT ); Fri, 20 Sep 2019 03:44:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:34332 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393041AbfITHom (ORCPT ); Fri, 20 Sep 2019 03:44:42 -0400 Received: from localhost (unknown [89.205.140.247]) (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 9BBB3207FC; Fri, 20 Sep 2019 07:44:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568965480; bh=awK4sAwt/JjMC+qdomldJWdCvOM2PA4r6OZQgPo1DqI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=U/cwmxekngFhaPZNkQ6wywr8rCKTv14qhZZw2n8Qq+84hQg8BoMIDKI1vpRDZ7dYw D/lAA+MU1rN8F/H9LFkAZcROApnH7HXSJcMewlGNDb9ySj785OjbSnjnUTv3yb0jBi e4CC98bkjexwau4+2sY+Wh1OuzV2+rHpGzsAvcz0= Date: Fri, 20 Sep 2019 09:44:36 +0200 From: Greg KH To: Andrea Vai Cc: Alan Stern , Johannes Thumshirn , Jens Axboe , USB list , SCSI development list , Himanshu Madhani , Hannes Reinecke , Ming Lei , Omar Sandoval , "Martin K. Petersen" Subject: Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 Message-ID: <20190920074436.GA518462@kroah.com> References: <3d9bf0023e01e6b29c85c2099b7466e94d06a090.camel@unipv.it> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3d9bf0023e01e6b29c85c2099b7466e94d06a090.camel@unipv.it> User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On Fri, Sep 20, 2019 at 09:25:17AM +0200, Andrea Vai wrote: > Il giorno gio, 19/09/2019 alle 13.54 -0400, Alan Stern ha scritto: > > > > In general, USB flash drives should not be expected to work as well > > as > > an actual disk drive connected over USB. > > Ok, so I think I'll buy some different hardware. Would an SSD drive > (connected over USB) behave like a flash drive or like an "actual disk > drive" from this point of view? It all depends on the drive. Some are a lot better than others, and it's almost impossible to tell until you buy the thing and try it out :(