On Wednesday 22 April 2009, Bartlomiej Zolnierkiewicz wrote: > On Tuesday 21 April 2009 12:02:22 Sergei Shtylyov wrote: > > David Brownell wrote: > > > > > Fix UDMA throughput bug: tCYC averages t2CYCTYP/2, but the code > > > previously assumed it was the same as t2CYCTYP. > > > > Wow, thanks for finding it! > > .... > > > > > Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx> > > > > The patch itself is: > > > > Acked-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx> > > applied Thanks. Further experimentation suggests (a) doing timing computations in picoseconds, rather than nanoseconds, gives better answers and makes that "slow" system faster by 25% or more; and (b) increasing all the UDMA timings by one clock cycle gives another few percent. Now (a) makes obvious sense; but (b) seems odd ... - Dave -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
