Am Freitag, 30. März 2007 19:56 schrieb Greg KH:
> > The bottom line is, there's no excuse for using any kind of smp_mb()
> > in USB drivers. None at all. When we have 100Gbit/s USB, then perhaps
> > we can talk about it.
>
> Perhaps then, but even then, I doubt it...
That's not the issue. The question is not what we USB needs in terms
of performance. Every time we use a lock we screw anybody caring about
interrupt latency. The amount of work some drivers do in irq is awful.
Usbnet is the laudable exception.
Regards
Oliver
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