DragonFlyBSD 2.0 RELEASE SCHEDULE / livelocked limit engaged error

[Hasso Tepper]

Vincent Stemen wrote:
> There is a bug that has been lingering for some time that I would sure
> like to see fixed.  We have not been able to run a serial ATA DVDRW
> drive on any of our machines.  Any time it is connected, we get
> continuous repeating errors like
>
>     intr 10 at 40001/40000hz, livelocked limit engage!
>     intr 10 at 19810/20000 hz livelock removed.
>
> We have found a few past postings apparently about this issue that
> suggested that the problem might be related to USB.  We have found no
> other mention of the problem being related to SATA CDRW/DVDRW drives.
> However, it only occurs on our machines when an optical SATA drive is
> connected.  SATA *hard* drives work fine and USB works fine otherwise. 
> We have tested on two different Intel machines, and an AMD64 machine,
> with an add on PCI SiI 3512 SATA150 controller card.  We also tested
> with the on board VIA 6420 SATA150 controller on the AMD64 machine. 
> The problem exists in all cases.  We have also tested with 3 different
> SATA CD drives.

Seen that many times. Actually I think that it's a bug in hardware, not in 
OS (nata, ACPI or whatever) - I've seen several hardware combinations 
where BIOS update fixes the issue (this includes my current desktop). 

It _might_ help if you switch SATA controller into legacy IDE or 
compatibility mode from BIOS. But it also might happen that SATA CD/DVD 
drive will not be detected at all in this case.


-- 
Hasso Tepper