On Mon, Sep 13, 2010 at 07:23:49PM +0200, Axel C. Voigt wrote: > Hi Greg, > > I want to test the performance of a linux box (and the serial subsystem) > that is connected to the internet with multiple (lets say 5 for this > example) usb data sticks running at speed above 7.2MBs. I then end up with > multiple ppp devices ppp0 to ppp4. My interest is whether this setup would > be capable of e.g. downloading 5 different files from 5 different ip > addresses (having set the routes properly to use the respective pppX device) > at speeds around 50MBit/s? Then just connect the devices with a "real" serial port running at that speed to see if the serial subsystem can handle it. And then note that we achieve faster than those rates with the usb-storage subsystem, so the usb core must be able to handle it. Then there's the usb-serial driver, and that might need to be tweaked to have a bigger queue of urbs if you really do have a network that fast to get it to keep all data in flight at the time with no pauses. But as you really don't have a device that can go that fast, why need to test any of this? :) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
