Hello to all, Alan, after your instruction i've included 'usbmon' in my kernel. Surfing in menuconfig, i've been tempted to include also: - Root Hub TT - Improved TT scheduling Situation changed after this recompilation: - Error -28 disappear !!! - Playback work like previous build, (i've no applied quantitative markers different from my hears) - Record go on but sound seems really bad. Going deeply on such 'badness', i've seen that - Right channel is always ok (in quality is similar to playback) - Left one has spikes error over samples. In detail: o say 90% of urbs have one single error (one 16 bit sample is wrong) o say 5% of urbs have 2 error o say 5% of urbs have 0 error Spike error is 10:100 times greater (few time less) so resulting data is seriousely damaged. Strangly error follow sign of data. I attach you requested data. Can you suggest me how to proceed to found the cause of this problem? Is possible for example to save binary data about transfer (not only arrive time, size, direction), eventually separated from HUB -> DRIVER HCD and DRIVER HCD -> MY DRIVER? Have you even heard about such 'spike error' behavior? --- Gio 23/4/09, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> ha scritto: > Da: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Oggetto: Re: Audio driver on 2.6.26 over an HUB > A: "Salvatore Lionetti" <salvatorelionetti@xxxxxxxx> > Cc: "Greg KH" <greg@xxxxxxxxx>, linux-usb@xxxxxxxxxxxxxxx > Data: Giovedì 23 Aprile 2009, 15:38 > On Wed, 22 Apr 2009, Salvatore > Lionetti wrote: > > > Hi > > > > Many thanks for your attention. > > > > - The controller is HS only, so FS device like > http://www.trust.com/products/product.aspx?artnr=14134 > i'm using is not recognized at all without hub, > > - When i start submit urb for recording, no other kind > of urb is/'ll be started before got error. Moreover the > playback bandwidth is 4 times higher than record one, since > there exist 4 stero output ch. Follow the layout of isoc > urb: > > o Playback urb: 1 packet, 704 bytes each (44 sample, > 4ch, 16bit, stereo) > > o Record urb: 1 packet, 200 bytes each (100 sample, > 1ch, 16bit, stereo) > > Is possible to saturate bus with Record and not for > Playback direction? > > Can you post the "lsusb -v" output for your audio device, > and also > usbmon traces showing what happens during playback and > recording? > > If your description is accurate, recording should not > saturate the bus. > > Alan Stern > >
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