Re: [ivtv-devel] Log in/out DMA Error

[Paul Check]

After re-reading my own message, I guess the other solution is just drop the fb and go out the video card, that way I could keep smp in the kernel. Hmmm.....I was thinking of doing this anyway as I was thinking of upgrading the whole system to an HD firewire capture solution, or maybe a dual ivtv / firewire capture (so I'd have my choice) and single output via video card. Hmmmmmmmmmm................ Regards, Paul Paul Check wrote: But, I have tried 0.2.0rc3g and 0.3.0f (?) and the problems are actually worse, as then the ivtv-fb is even less stable. Note that this is the difference between our machiens (at least your pvr250...I'm not familiar with the 500). Without the ivtv-fb, everything works fine for me too. It's just the fb on the pvr350 that is causing problems. Another poster suggested it is indeed SMP..I'll play around with it and report back. But, it would really be a bummer to have to run non-smp to get 100% stable performance on the fb. Not sure I'd make that trade-off. Hopefully I don't have to?! Regards, Paul Jason Knisley wrote: well, that's a heck of an old version of ivtv. I have a an SMT/SMP enabled kernel with hyperthreading and a dual Xeon 2.5g board on the production machine (the one with the 250, not the 500) and things generally work for nearly a week before I need to restart. (Some weird sound errors of late.. Maybe I should update that one to a newer ivtv than 0.3.2t) Thanks, Jason --- "D. Hugh Redelmeier" <[EMAIL PROTECTED]> wrote: | From: Paul Check <[EMAIL PROTECTED]> | I'm getting DMA erros on my system with various versions of ivtv and firmware. | Currently I'm working with version 0.1.9 of the ivtv driver with firmware | pvr250_18_22037.exe (0.2.0rc3g gives me headaches with ivtv-fb). All the | problems I've had with ivtv (any version) seem to relate to DMA errors. I'm | running 2.4.26 on a dual Xeon (HT enabled too) Supermicro X5DA8 motherboard | with seagate scsi disks, all firmware up to date. WARNING: PURE SUPPOSITION. I've seen it suggested that ivtv didn't work with preemption enabled. <http://www.mail-archive.com/ivtv-devel@lists.sourceforge.net/msg01614.html> Jim Reese wrote: have had no trouble with both Fedora 2 and 3 as long as you recompile the kernel without REGPARM, 4KSTACKS and pre-emption. I doubt that REGPARM is a problem, but am not sure. There was a report on the list that REGPARM was not a problem. 4KSTACKS is a problem, but several patches (including one from me) claim to solve that problem. That leaves pre-emption: is it a problem? If this is in fact the case, it is very likely that ivtv would not work with HT enabled and used by an SMP kernel. The reason is that preemption takes advantage of the same locking mechanisms as SMP, and HT is a kind of SMP. This would mean that ivtv probably does not have sufficient locking protecting resources that might be shared between different threads of control in kernel code. If you run a non-SMP kernel without preemption enabled, do you get the same problem? You may have to configure and build your own kernel to answer that question. Hugh Redelmeier [EMAIL PROTECTED] voice: +1 416 482-8253 ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ ivtv-devel mailing list ivtv-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ivtv-devel ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ ivtv-devel mailing list ivtv-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ivtv-devel