Harondel J. Sibble wrote:
>
> On 24 Mar 2008 at 23:27, Tom Metro wrote:
>
>> [60.710413] ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
>> [61.096095] PCI: Setting latency timer of device 0000:00:06.0 to 64
>> [67.561088] ivtv1: Unreasonably low latency timer, setting to 64 (was 32)
>
> Those are some of the errors, but those are fairly common on many linux
> machines I've seen, can't seem to find how I came up with this, started with
> some postings to the ivtv lists.
>
> Anyhow the mythtv wiki has a good entry on this
>
> http://www.mythtv.org/wiki/index.php/PCI_Latency
>
>> I looked into this back when I first deployed the system in the Fall of
>> 2006, and I don't recall what I found, but I'm pretty sure I never
>> implemented any fixes.
>
> It helps! I was getting several lockups a week until I implemented this.
>
>> It locks up some of the time when I transcode using mencoder, and once
>> when using ffmpeg. I used mencoder to transcode only rarely, and stopped
>> using it because of this.
>
> Most of those things have 2 things in common, high cpu and high disk usage,
> adjusting the pci latency helps with the latter.
>
>>> ...and what exactly do the lockups look like?
>> Black screen or normal looking but frozen screen. Unresponsive to
>> network connections or existing ssh connections.
>
> Yup, that about sums up the problem, it was most noticable when multiple
> concurrent recordings were set to go off.
>
>>> My Sempron has a VIA chipset.
>
> I'm also using a VIA based system
>
> Anyhow, here's the line from my /etc/init.d/rc.local
>
> ### added Sep 25/07 to allow more pci throughput from multiple tv tuner cards
> to the hard drives
> setpci -v -s 00:07.1 latency_timer=[b0]
>
>
All of my latencies are set to 64, and I don't have any crashing of the type
that you describe (I have 2-150's and 1-atsc 5500), and a pci 4 port sata card,
and I don't get the unreasonably low latency error.
I think those parameters are set by the bios (they are controllable in some
bioses), so it is likely a bios bug causing it.
Roger
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