From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754520AbZCNEFm (ORCPT ); Sat, 14 Mar 2009 00:05:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751487AbZCNEFI (ORCPT ); Sat, 14 Mar 2009 00:05:08 -0400 Received: from kroah.org ([198.145.64.141]:50940 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751049AbZCNEFH (ORCPT ); Sat, 14 Mar 2009 00:05:07 -0400 Date: Fri, 13 Mar 2009 21:03:22 -0700 From: Greg KH To: Ralf Nyren Cc: linux-kernel@vger.kernel.org, klloyd@sierrawireless.com Subject: Re: Sierra Wireless (MC8780) HSDPA speed issue Message-ID: <20090314040322.GB3417@kroah.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 13, 2009 at 04:01:19PM +0100, Ralf Nyren wrote: > Hi, > > I have a Sierra Wireless MC8780 UMTS card in a Fujitsu S6410 laptop running > kernel 2.6.28.7. In kernel sierra driver v1.3.2. > > The card works but speed seems limited to approx 1.0 Mbit/s download using the > linux driver. Testing the card in Windows XP yields download speeds close to > 5.0 Mbit/s. > > I recently updated the firmware of the card to support HSDPA/HSUPA. The update > gave the desired result in Windows but not in Linux. The speed improved in > Linux but didn't increase above 1 Mbit/s. > > Is there any known driver limitations or is this a configuration issue? > > Please let me know if you need any additional information. Are you testing up or down speeds? If you want to, and you think the driver is the problem, try changing the values in drivers/usb/serial/sierra.c: /* per port private data */ #define N_IN_URB 4 #define N_OUT_URB 4 #define IN_BUFLEN 4096 Try bumping up the N_IN_URB and N_OUT_URB values a bunch and let me know if things go faster now. thanks, greg k-h