> From: Vojtech Pavlik <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Re: [linux-usb-devel] What about NO_FSBR in acm
> Date: Thu, 14 Jun 2001 18:59:08 +0200
> > > From: Pavel Machek <[EMAIL PROTECTED]>
> > > To: [EMAIL PROTECTED]
> > > Date: Wed, 13 Jun 2001 00:42:16 +0200
> >
> > > > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=39238
> > > >
> > > > I think I'll just take that flag off from the read URB for us.
> > >
> > > ...and you get 5x slowdown on PCI bandwidth when using modem...
> >
> > Users prefer 5x slowdown to not working modem, evidently.
>
> Uh? The modem should work just fine with the NO_FSBR flag, just with its
> speed limited to about 64 kbytes/second. (One 64-byte packet per USB
> frame). And 64 kbytes/second is quite a lot for any modem out there,
> even ISDN can't do more than 16 kbytes/second uncompressed.
>[...]
> There may be different problem, though. I do have the 3Com ISDN TA, so I
> can test it. I don't have an ISDN line, though. I'll try to enable
> internal loopback in the TA.
"The modem should work", but it does not. See the bug.
Personally I think the 3Com crap is busted in the flow
control department, so when it spits "CONNECT", it gets
overun by the data inside the 3Com box. It does not change
much in the argument though.
BTW, you miscalculated the ISDN speed: it's dual channel,
not single, so it's 32 KB/s when sustained.
-- Pete
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