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

Brian L. Walter blwalter at gmail.com
Sat Jun 2 11:38:21 UTC 2007

Brian Wood wrote:
> 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.
I have an Asus M2N-SLI deluxe - I've had the same issue - unable to 
change the disk drive latency (sata).  I believe this is an NVIDIA based 


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