Re: [PATCH] usb audio.

From: Erik Mouw (J.A.K.Mouw@ITS.TUDelft.NL)
Date: Fri Oct 13 2000 - 12:09:19 EST


On Fri, Oct 13, 2000 at 08:56:53AM -0700, Dunlap, Randy wrote:
> You shouldn't see the <clipped> messages about bandwidth alloc
> increased|reduced unless you are running at console loglevel
> 7 or higher (KERN_DEBUG) (could be via Alt-SysRq-7).
> I'll see about removing them anyway.

I didn't see them on console, I heard the hickups, so I looked into the
logfiles.

> I don't know about the sound hickups you are hearing. Tom Sailer
> suggested just a day or two ago something about changing the
> latency for the USB controller by using setpci.

I tried:

  setpci -s 00:07.2 latency_timer=20
  setpci -s 00:07.2 latency_timer=40
  setpci -s 00:07.2 latency_timer=80

but without effect. However, the USB device doesn't have a latency
timer, so that probably explains.

> BTW, lspci -vv would give much more useful info than just
> using lspci. E.g., it would show the current latency
> value being used.

OK, information is attached.

Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2783635  Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/


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