> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:ivtv-devel- > [EMAIL PROTECTED] On Behalf Of Hans Verkuil > Sent: 20 November 2005 22:01 > To: Discussion list for development of the IVTV driver > Subject: Re: [ivtv-devel] ivtv framebuffer is broken with PVR350 > > On Sunday 20 November 2005 00:25, Ricardo Lugo wrote: > > "classic smp problems" means its time for more locking, no? > > So I played around with some of the locking of enc_work_handler and > > dec_work_handler: > > > > When enc_work_handler and dec_work_handler are blocked on the same > > lock, no freezes occur. (IE only one part of the card can work at a > > time: Encoder or Decoder) > > > > When I gave dec_work_handler its own lock (for all the code in the > > entire function), the freezes came back. (IE Encoder & Decoder > > working together) > > > > What is wierd about this is that I don't have to be using the Encoder > > for the Decoder to freeze up! > > > > Conclusion: there must be something that the ENC functions do to > > (being called even when the ENC is idle) that invalidate the DEC dma > > stream on multi-processor (or multi-threaded) machines. IE we need > > more fine-grained locking. > > Rick, > > Can you mail me a patch with your changes that make it work on an smp > machine? > > Thanks, > > Hans > And me as well or just mail it to the list.
Thanks JOhn _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
