On Thu, Jan 10, 2008 at 11:04:43AM +0100, Ingo Molnar wrote: > > * Andi Kleen <[EMAIL PROTECTED]> wrote: > > > > WBINVD isnt particular fast (takes a few msecs), but why is that a > > > problem? Drivers dont do high-frequency ioremap-ing. It's > > > typically only done at driver/device startup and that's it. > > > > Actually graphics drivers can do higher frequency allocation of WC > > memory (with PAT) support. > > but that's not too smart: why dont they use WB plus cflush instead?
Because they need to access it WC for performance. > ioremap() will always be slow and we dont care about stupid uses of it. Uninterruptible msec latencies are too slow even for slow path initialization code imho. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
