Hi Alistair, > usb 4-1.4: reset full speed USB device using ehci_hcd and address 4
a bug fix for ehci + iso urbs bandwidth allocation just got posted to the usb mailing list. So I suggest trying uhci instead (OK, I just saw that you tried it). ... > As you can see, the recv buffer has dropped but nothing has changed. Then I > had the idea to remove ehci-hcd, and force it to use uhci-hcd for the USB 1.1 > device (I have no USB 2.x devices anyway). This was successful: ... > I was able to bring pppd up over the interface. /proc/bus/usb/devices looks > like this; only 79% utilisation. What do you mean by "79% utilisation"? > T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 > B: Alloc=710/900 us (79%), #Int= 2, #Iso= 4 > D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > P: Vendor=0000 ProdID=0000 Rev= 2.06 > S: Manufacturer=Linux 2.6.15.1 uhci_hcd > S: Product=UHCI Host Controller > S: SerialNumber=0000:00:10.0 > C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA > I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub > E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255m > > My bandwidth is still locked to just under 500KB/s (4MBits). So either a) > isoc > isn't working or b) you need to do more than just switch from bulk to isoc to > get 8Mbits from this device. This is what I see. Using bulk I max out at a bit under 4 megabaud. With isoc I max out at an even slower rate! > The Windows workaround does not suggest this, but I suppose it is impossible > to tell. What is "the windows workaround"? (I don't have windows, which makes comparing with windows a bit awkward for me). > If it's a useful datapoint, I used to get sporadic errors and the USB LED > would flash RED if the bandwidth was held close to 4Mbit for a long period of > time. This no longer seems to happen with isoc, suggesting the bandwidth > bottleneck has been lifted. However, I do not see the 6.6 megabits I've > synced at. Are you talking about linux or windows here? Can you get 6.6 mb with windows? Anyway, I think it likely that there is something wrong with the driver. But it could be a hardware limitation. Testing with windows should clear that up. If you can do some experiments with windows, that would be great. Ciao, Duncan. Liste de diffusion modem ALCATEL SpeedTouch USB Pour se désinscrire : mailto:[EMAIL PROTECTED]
