From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Neukum Subject: Re: [Bug 12207] block reads/writes > 122880 bytes to USB tape drive gives EBUSY Date: Tue, 23 Dec 2008 13:31:21 +0100 Message-ID: <200812231331.22204.oliver@neukum.org> References: <20081223073049.D4AB3108040@picon.linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp-out003.kontent.com ([81.88.40.217]:50305 "EHLO smtp-out003.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750955AbYLWMcS (ORCPT ); Tue, 23 Dec 2008 07:32:18 -0500 In-Reply-To: <20081223073049.D4AB3108040@picon.linux-foundation.org> Content-Disposition: inline Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: bugme-daemon@bugzilla.kernel.org Cc: linux-scsi@vger.kernel.org Am Dienstag, 23. Dezember 2008 08:30:49 schrieb bugme-daemon@bugzilla.kernel.org: > http://bugzilla.kernel.org/show_bug.cgi?id=12207 > > > kai.makisara@kolumbus.fi changed: > > What |Removed |Added > ---------------------------------------------------------------------------- > CC| |kai.makisara@kolumbus.fi > > > > > ------- Comment #3 from kai.makisara@kolumbus.fi 2008-12-22 23:30 ------- > I have been testing large blocks with 2.6.27.7 and I was able to reach 6 MB > without any tricks. The difference between your system and mine is that my tape > is connected with SCSI and yours is with USB. > > Looking at linux/drivers/usb/storage/scsiglue,c I find the following: > > /* limit the total size of a transfer to 120 KB */ > .max_sectors = 240, > > Maybe the USB experts can tell what is the reason for this. Many USB devices fail larger transfers. Regards Oliver