Messages in this thread | | | Date | Tue, 22 May 2007 10:19:26 -0700 | From | Stephen Hemminger <> | Subject | Re: Linux 2.6.22-rc2 |
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On Mon, 21 May 2007 22:04:26 -0700 (PDT) Linus Torvalds <torvalds@linux-foundation.org> 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 <shemminger@linux-foundation.org> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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