From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Hofman Subject: Re: Period time/size in adaptive USB - alignment to nrpacks? Date: Sun, 01 Jan 2012 18:01:16 +0100 Message-ID: <4F00915C.7070100@ivitera.com> References: <4EF8D3FB.8090109@ivitera.com> <4EFB763F.7030407@ivitera.com> <16ced9db-de9c-476b-bb3c-7af436aab558@email.android.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from cable.insite.cz (static-84-242-75-189.net.upcbroadband.cz [84.242.75.189]) by alsa0.perex.cz (Postfix) with ESMTP id B4162243ED for ; Sun, 1 Jan 2012 18:01:32 +0100 (CET) In-Reply-To: <16ced9db-de9c-476b-bb3c-7af436aab558@email.android.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Clemens Ladisch Cc: ALSA development List-Id: alsa-devel@alsa-project.org On 29.12.2011 09:43, Clemens Ladisch wrote: > Pavel Hofman wrote: >> Now please see the wireshark screenshot at >> http://personal.educity.cz/dustin/wireshark.png . Frame 1197 is the last >> URB of the period, with 960 bytes only. Yet the time distance around it >> is again 8 ms (12.808-12.816-12.824). The expected 5 ms lag appears 2 >> URBs later, between frames 1201 and 1203 (12.832-12.837), all holding >> 1536 bytes. > > Wireshark shows the URBs when they are submitted, which > is in the completion handler of some previous URB. > This means that the timing of the submission has no > relation with its size. Hi Clemens, thanks a lot for the clarification. Everything seems to be all right and verified :-) Best regards, Pavel.