On 11.04.2012 10:35, Wink Saville wrote: > Do you have a read barrier in the IRQ? Ah, no I don't. > See "SMP BARRIER PAIRING" in: > > http://www.kernel.org/doc/Documentation/memory-barriers.txt [3] I saw that but only skimmed it. I'll let the mailing list know if it worked when I get a chance to try it. thanks, -Chris