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Date: Tue, 27 Dec 2011 17:25:58 +0100
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To: Hans Petter Selasky <hselasky@c2i.net>
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Subject: Re: USB problems with 8.2
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At Tue, 27 Dec 2011 16:51:46 +0100,
Hans Petter Selasky wrote:
> 
> On Tuesday 27 December 2011 16:48:48 Момчил Иванов wrote:
> > At Tue, 27 Dec 2011 16:28:49 +0100,
> > 
> > Hans Petter Selasky wrote:
> > > On Tuesday 27 December 2011 16:21:35 Момчил Иванов wrote:
> > > > 16:13:27.509643 usbus6.2
> > > > DONE-BULK-EP=00000081,SPD=HIGH,NFR=0,SLEN=0,IVAL=0,ERR=
> > > 
> > > Hi,
> > > 
> > > The timeout error means the USB host is not getting the expected data.
> > > 
> > > To figure out who is guilty not transferring or receiving the data you
> > > need to have an USB analyzer, like the Beagle 480 (Runs under Linux).
> > > 
> > > Else also see the quirks in:
> > > 
> > > sysctl -a hw.usb.ehci
> > 
> > sysctl: unknown oid 'hw.usb.ehci'
> > 
> > btw I don't seem to have any hw.usb.ehci sysctl... This is all that there
> > is under hw.usb:
> > 
> > hw.usb.no_boot_wait: 0
> > hw.usb.debug: 0
> > hw.usb.usb_lang_mask: 255
> > hw.usb.usb_lang_id: 9
> > hw.usb.template: 0
> > hw.usb.power_timeout: 30
> > hw.usb.no_pf: 0
> > hw.usb.no_cs_fail: 0
> > 
> > Since I don't have this kind of equiptment, I will not be able to do
> > anything more. Is there some way I can set that timeout to something like
> > 1-2 seconds?
> 
> sysctl hw.usb.ehci
> hw.usb.ehci.lostintrbug: 0
> hw.usb.ehci.iaadbug: 0
> hw.usb.ehci.no_hs: 0
> hw.usb.ehci.debug: 0
> 
> I think you need to build a kernel with "options USB_DEBUG" before the 
> lostintrbug will be available! I suspect setting this parameter will solve 
> your problem!

I've just rebuilt the kernel with "options USB_DEBUG" and rebooted without setting the cache quirk but with "hw.usb.ehci.lostintrbug=1" and rtorrent just hashed more than 4 GB without any stalls. So that seems to fix the issue. Man EHCI(4) needs to fixed since it does not mention anything about that kernel option, should I file a pr?

Thank you for your time.