linux-kernel - Re: understanding firmware loader for speedtouch (kernel 2.6.21.5)

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Date:	Tue, 10 Jul 2007 12:32:33 +0200
From:	mikie <mikie.pl@...il.com>
To:	"Duncan Sands" <duncan.sands@...h.u-psud.fr>
Cc:	"Indan Zupancic" <indan@....nu>,
	"Kay Sievers" <kay.sievers@...y.org>, linux-kernel@...r.kernel.org
Subject: Re: understanding firmware loader for speedtouch (kernel 2.6.21.5)

2007/7/10, Duncan Sands <duncan.sands@...h.u-psud.fr>:
> On Tuesday 10 July 2007 11:13:09 mikie wrote:
> > 2007/7/10, Duncan Sands <duncan.sands@...h.u-psud.fr>:
> > > > I also tried a couple of other firmwares available on the net, and
> > > > also the one from Windows XP install (which works and achieves speeds
> > > > of up to 720kbyte/sec downlink). Some of the firmwares did not work
> > > > either, and some worked the same way - it means not more than 3mbit/s
> > > > (around 400kbyte/s) could be achieved.
> > >
> > > I'm pretty sure you won't get anything faster out of a revision 2 modem.
> >
> > Too bad to hear that :/
> > Especially that windows does this with the same modem without a hitch.
>
> Really?  In that case I take it back, the hardware can clearly do it :)  Presumably
> you are using the firmware that came with windows?  Which kernel version?  Also, what
> synchronization speed is reported?

Yes, the hardware in the modem can do it for sure. I have a laptop
with a pentium4 CPU, USB2.0, windows XP installed. I attach the same
modem to this laptop and I can go up to 730..740 kbyte/s (the same
phone line of course). Windows XP had to be modified with a registry
tweak (from thomson website) to switch to isochronous mode and it
works.

However my server running linux is on a ECS motherboard (P6BAP as I
remember), Celeron 633 CPU, USB1.1. I have compiled quite fresh kernel
2.6.21.5

I am 100% sure that I use the same firmware for the modem, because I
copied it directly from windows XP from laptop.
Now since the modem itself can go as fast as 6mbit/s, I am only
concerned if the _computer_ hardware on my linux server box can do it
via USB ? I can see the usb reporting it to be at 12Mbit/s, which
should be enough to reach 6mbit/s teoretically. CPU load is normal
even during transfers.
I would have to install windows xp on that machine to be 100% sure
that both modem and computer hardware can go up to 6mbit/s via USB...

By the way, I just tried to switch sw_buffering in the speedtch module
but that did not help.

-- 
Regards,
MK
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