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Message-ID: <ca35ce500707110422j73c5c256i384327c652b7ccba@mail.gmail.com> Date: Wed, 11 Jul 2007 13:22:39 +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, mikie <mikie.pl@...il.com>: > 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. I begin to think that the isochronous mode is not working. I tried the speedtch module with disabled and enabled isoc and there is no difference in transfer speeds at all. All I checked was : root@srv:~# cat /sys/module/speedtch/parameters/enable_isoc Y which as I now believe only means what options have been specified, but does not confirm the actual mode being in use. Especially that I do not see anything like "isoc support enabled" in any of the logs. Are there any requirements for UHCI hardware to support isoc mode ? Mine is: USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 08) (prog-if 00 [UHCI]) Or maybe I am missing something else? I am sure the isoc mode is supported by my modem, now I only have doubts if my hardware on server box supports this ? -- Regards, MK - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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