On Mon, 21 May 2007 22:04:26 -0700 (PDT) Linus Torvalds <[EMAIL PROTECTED]> wrote:
> > > On Mon, 21 May 2007, Stephen Hemminger wrote: > > > > AHCI on this motherboard doesn't seem to use MSI. The problems occur > > even if I boot with nomsi. > > Have you tried playing with PCI latency counters etc? > > Maybe the SATA/AHCI thing is better at saturating the bus, and the sky2 > hardware gets upset if it has overlong DMA access latencies due to some > other controller keeping the bus busy with a long burst access? > > I can't really see that being a real problem in this day and age of PCI-X > etc, but it _used_ to be a possible issue a decade ago. Maybe you've found > a case where it matters even on modern hardware? We occasionally used to > set the PCI latency timer to make people happy. > > (Not that I'm convinced it even has any semantic meaning on a modern PCI > system..) > > Linus The device in question is PCI Express, and the latency has no meaning (at least in vendor spec). -- Stephen Hemminger <[EMAIL PROTECTED]> - 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/
