Re: [linux-usb-devel] *BAD* impact of usb on PCI performance

[johan verrept]

Georg Acher wrote:
> 
> On Sun, Jun 03, 2001 at 10:54:21PM +0200, johan verrept wrote:
> 
> > How and when is this choice made?
> > What is the impact of let's say a common low speeddevice like a mouse of keyboard?
> > If this slows down the system in such a way, they could be considered unusable...
> 
> No, only bulk transfers are affected, low speed control has no loopback. The
> loop is switched on, when at least one URB is in progress, that has
> USB_NO_FSBR not set. It is switched off after ~50ms (if no new URBs are
> submitted).

So this does is a rather good reason not to simulate interrupt requests with bulk 
transfers (in
usbdevfs) ?

        J.

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