On Wed, 2006-16-08 at 13:21 -0700, Kristo Kriechbaum wrote: > Sander Sweers wrote: > > On Wed, 2006-08-16 at 12:13 +0200, Simen Thoresen wrote: > > [..] > >> The core functionality of this powermanagement feature is compiled into > >> the kernel (or as a module). On my kernel (2.6.16.6), the feature is > >> built as > >> CONFIG_X86_POWERNOW_K8=m > >> CONFIG_X86_POWERNOW_K8_ACPI=y > >> > >> ...for my Athlon64 cpu, in i386 mode - I assume it will be similar on > >> your system. > >> > >> On my system (no errors for a week or so), I am not only not running the > >> userspace manager, but I am also /not/ loading the module. > > > > You can control the CPUFREQ governors with sysfs. Try modprobing the > > cpufreq_ondemand and echo ondemand to the scaling governor. "echo > > ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor. Echo > > performance to make the cpu stay at maximum performance. > > > > Powernow will not only lower the cpu's frequentie but also the voltage. > > And as the memory controller in on the cpu with AMD64 this might cause > > the dma errors. > > > > Not sure about the above but if all the people with dma errors have an > > AMD64 this could be the issue. > > Interesting. I have an AMD64, and I did (do?) have the DMA problems. > I've been running with the PIO mode patch for some time now, but in the > next few days I hope to do some testing with your above suggestion. I > did have cpuspeed turned on. My machine is running an FC4 kernel. > > Kristo
I have been watching this thread with great interest. Here are the things that I noticed. - My problems only started with the 2.6.17 kernel and ivtv 0.7.0 - I read somewhere that this is an IRQ migration problem on SMP kernels so I turned off the irqbalance service. Stability increased since failures when from 1 - 5 minutes to 5 - 10 days. - When I switch to a UP kernel, stability increases again. - Someone mentioned a memory timing issue. I have two sets of dual channel memory. That might also be the cause. What this all tells me is there is an IRQ timing issue in ivtv. I have no way to prove this since I do not dive into code and am an average end user using RPMS from Axel. Does this help? Do others have similar experiences? My machine is an AMD64 x2 in x86_64 mode. Preet _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
