[mythtv-users] does setpci latency_timer fail on some mobos?

[Brian Wood]

Mark A. Miller wrote:
> I have been experimenting with MythTV recently.  After experimenting
> with assorted hardware and distros, my video is fairly good, but I get
> an occasional hiccup, especially in action scenes.  When I try to set
> the latency on the SATA controller to something high like AA, it stays
> at 0 (see configuration and screendump below.)
> 
> My questions:
> # Is the concept of PCI latency relevant on a PCIe system?  Are my
> integrated controllers like the SATA on PCI or PCIe?
> # Is it possible that some motherboards just refuse to change their
> latency values?
> # Is there some other I/O bottleneck I should be looking at?
>

I have seen reports here of motherboards that apparently do not allow
the setting of PCI latency, or at least the reported latency value does
not change. I seem to recall that at least some of these were
VIA-chip-based boards, but I could be wrong on that.

BEWW