Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751288AbVL3TNX (ORCPT ); Fri, 30 Dec 2005 14:13:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751290AbVL3TNX (ORCPT ); Fri, 30 Dec 2005 14:13:23 -0500 Received: from elasmtp-kukur.atl.sa.earthlink.net ([209.86.89.65]:45977 "EHLO elasmtp-kukur.atl.sa.earthlink.net") by vger.kernel.org with ESMTP id S1751288AbVL3TNW (ORCPT ); Fri, 30 Dec 2005 14:13:22 -0500 Date: Fri, 30 Dec 2005 14:13:15 -0500 (EST) From: Dan Streetman Reply-To: ddstreet@ieee.org To: Lee Revell cc: David Brownell , linux-usb-devel@lists.sourceforge.net, Alan Stern , Bodo Eggert <7eggert@gmx.de>, linux-kernel Subject: Re: [linux-usb-devel] Re: EHCI TT bandwidth (was Re: [PATCH] USB_BANDWIDTH documentation change) In-Reply-To: <1135886739.6804.4.camel@mindpipe> Message-ID: References: <200512270857.35505.david-b@pacbell.net> <1135886739.6804.4.camel@mindpipe> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-ELNK-Trace: a4c357c9134943511aa676d7e74259b7b3291a7d08dfec790f58622d9a310a9049cf5e0b0b276b49350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 24.148.162.106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1237 Lines: 33 On Thu, 29 Dec 2005, Lee Revell wrote: >How do I test them? Should this make USB audio work with >CONFIG_USB_BANDWIDTH? It won't have any effect on CONFIG_USB_BANDWIDTH, as the EHCI transaction translator scheudling code doesn't care about that config setting. This also won't have any effect on USB 2.0 devices (e.g. a highspeed Audio device). The updates will only help in the situation where there are multiple lowpseed or fullspeed devices with periodic endpoints, all connected to the same USB 2.0 (highspeed) hub. In that situation it's possible to "fill up" the USB 2.0 hub's transaction translator periodic schedule with only a few devices. The updates allow many more devices to fit in the TT's periodic schedule. The specific number of devices depends on how many periodic endpoints, those endpoint's poll rates, and their max packet sizes. -- Dan Streetman ddstreet@ieee.org --------------------- 186,272 miles per second: It isn't just a good idea, it's the law! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/