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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
