On Fri, 26 Sep 2003, Johnny Strom wrote: >so my question is the bandwith enough on the PCI bus to start a capture >of four .jpeg files from four cards at the same time and then sleep for >one second after the capture? Yes, jpeg compressed images don't use much bandwidth (if the compression is performed in hardware before the image gets into main memory). >01:00.0 Multimedia video controller: Brooktree Corporation Bt878 Video >Capture (rev 11) ...but Bt878 can't do hardware compression. So I suppose the drivers actually capture uncompressed and compress in software. Let's say it's PAL resolution 768x576@25fps 4:2:0 = 16 MB/s, or 64 MB/s for four simultaneous captures. PCI bandwidth (IIRC) is 133 MB/s, so in theory it would work. In practice... it's difficult to say. >start getting kernel oopses like the ones below, so could the tree >oopses below be becouse of a badblocks on the swap or memory related or >becouse of to much data on the pci bus at the same time? Maybe bad blocks in the swap, if you suspect that, maybe bad memory. But simply overloading PCI bandwidth definitely shouldn't cause oopses (instead Bt8x8 drops data which would cause corrupted images). >I did try to cahnge the memory but I still get ooopses. I would guess it's some hardware/software conflict/bug. Try different kernel versions and compile it with different options.
