On Fri, Mar 27, 2009 at 1:21 PM, John Robinson <[email protected]> wrote: > On 23/03/2009 18:21, Francesco Bochicchio wrote: >> 2009/3/22 Xavier Bachelot <[email protected] <mailto:[email protected]>> > [...] >> I think it was never really fixed and the support is disabled by >> default. Grep for CONFIG_X86_LONGHAUL in your kernel config. >> >> I can add that this option is one of the differences between the >> 'faulty' kernel, which has the option enabled as module, and the 'good' >> one, which has it disabled. >> However, I'm not sure about this diagnosis: my box is permanently on >> and running a P2P program which usually uses between 15% and 40% of >> CPU time. When I play a movie, I don't stop that program, so at least >> 15% of CPU is always used. If the failure was due to an attempt to >> downclock the CPU, it should occur sometime also without playing a >> movie, e.g. when the P2P program run out of sources. It never occurred >> despite an uptime of days with the P2P program always running. > > Yes, but almost any time you do anything interactive, like start playing > a DVD, the CPU speed gets put back up to the maximum, and the crashes > only seem to occur on speed changes when there's heavy I/O: your P2P > program's I/O won't be much more than your upstream connection speed x2 > (from disc, to network), while playing video involves much more data > coming from disc then shuffling a screen's worth of data around 50-60 > times per second.
Speed doesn't actually have anything to do with these crashes; It is because the DMA engine get confused by the switching CPU speed in combination with Busmaster DMA. The acceleration code uses BM-DMA (and so does the IDE and some capture cards) network doesn't use BM-DMA. _______________________________________________ openchrome-users mailing list [email protected] http://wiki.openchrome.org/mailman/listinfo/openchrome-users Main page: http://www.openchrome.org Wiki: http://wiki.openchrome.org User Forum: http://wiki.openchrome.org/tikiwiki/tiki-view_forum.php?forumId=1
