Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-2

[Eran Mann]

Ingo Molnar wrote:
> * Eran Mann <emann@xxxxxxx> wrote:
>
> > Right on.
> > After hdparm -d0 I see maximum latency of 35 us after a full kernel 
> > build with a few GUI apps in the background. I´ll try to find a 
> > reasonable compromise.
>
> it might make sense to report this to the hw vendor as well, as these
> latencies dont occur at _every_ IDE DMA, it might be some sort of
> chipset (or BIOS) bug they might want to see resolved as well (if this
> isnt a ship-and-forget vendor). 2 msec stalls are not nice to a fair
> number of applications.
>
> 	Ingo

It´s a rather old white-box machine with a noname VIA-based motherboard, 
So I don´t really have whom to report the problem to. On the other hand 
with udma2 I see latencies < 170 us which seems reasonable.
Thanks for the advice.
  Eran.
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