On Fri, Jul 23, 2010 at 04:50:32PM -0400, Charlie Brady wrote: > > On Fri, 23 Jul 2010, Bob Tracy wrote: > > > On Fri, Jul 23, 2010 at 10:07:09AM +0200, Pascal Hambourg wrote: > > > Bob Tracy a ?crit : > > > >>(Issues with a DM9601 USB 1.1 10/100 Ethernet adapter.) > > Do you have design docs for the advice? If not (and even if you do) is it > worth the time and effort to fix the driver? > > How can USB 1.1 support 100MB? I suppose the same way old 16-bit PCMCIA cards do: rely on flow-control to throttle-back. You can't get 100% of 100 Mb operation, but you can definitely get better throughput than with a 10 Mb connection. As to the question of whether a driver fix is worth the trouble, I guess that depends on whether one ends up relying on the device for whatever reason. Case in point: I needed a wired interface different from the 1 Gb built-in interface on my Dell D630, because the built-in interface absolutely refuses to function properly when hooked up to at least one 10 Mb network where the infrastructure cabling is CAT 3. So far, all the 10/100 NICs to which I have access have no difficulty using the 10 Mb network mentioned: the problem seems limited to specific gigabit NICs. Pure speculation on my part, but I'm guessing most users are hesitant to report problems with cheap hardware because they *expect* problems and assume the hardware is to blame. Normally, that's a good assumption. Fortunately (?), I always question it because we tend not to be surprised/impressed if an inexpensive product actually does what its manufacturer claims. Why not assume the hardware is innocent until proven guilty? :-) So, yeah... For me, a fixed Linux driver would be nice to have because the device functions reliably with WinXP (albeit with a reduced MTU). As for availability of the design docs, yes, they're available: try http://www.meworks.net/userfile/24247/DM9601-DS-P03-102908.pdf The manufacturer's web site is http://www.davicom.com.tw. The Linux 2.6 driver available there is based on early 2.6 kernels, i.e., pre-usbnet, and no netdev_ops and friends. It has at least one useful feature that didn't make it into the mainstream driver: hard-setting 10/100 half/full duplex mode vs. auto-sensing. --Bob -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
