(sorry for breaking the threading, the reply came faster than my subscription to the list :) >From Ninja <Ninja15@xxxxxx>, > Hi, I noticed some SMP problems with the mantis driver as well (see my > post "Mantis CAM not SMP safe / Activating CAM on Technisat Skystar HD2 > (DVB-S2)"). One workaround for me is to limit the CPU to one core (to be > sure disable the hyperthreading cores as well). That can be done via BIOS > *or* adding maxcpus=1 as kernel parameter *or* you can disable the cores > one by one via "|echo 0 > /sys/devices/system/cpu/cpuX/online|" where X > is the core to disable. Since you need to be root for this, I did "sudo > su" first. But of course our problems might be completely unrelated and > limiting to one core won't change a thing ;) > > Manuel I doubt I'll revert back to the stock mantis module to test right now, but your suggestion and observations might certainly be of interest. If/when Ubuntu releases a new kernel which overwrites my current driver I will give it a go. However, instead of disabling SMP completely I hope adjusting IRQ affinity could be sufficient: http://kernel.org/doc/Documentation/IRQ-affinity.txt Couple this with increased PCI latency might work, however with three devices connected I think the only solution is to reduce the number of interrupts (though I am by no means any expert on this subject). -- Vidar Tyldum vidar@xxxxxxxxxx PGP: 0x3110AA98 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
