Thanks for your response On Sat, 2006-01-28 at 19:32 +0000, Mark Cooke wrote: > > > > cat /proc/interrupts |grep ivtv > > 19: 186698 IO-APIC-level ivtv0, ivtv2 > > 20: 1586430 IO-APIC-level ivtv1, nvidia > > > > Could this be the source of my problem ? Or should I just invest in some > > lightning fast sata disks in a raid whatever (depends on my financial > > posibilities :-) ) > > Dear Chris, > > Your drives should be more than capable of the necessary speed. > > 3 streams at 12mbit/sec is only 4.5MByte/second > > The seek overheads for writing 3 streams should not drop your LVM > performance to a level it can't support that. > > > You should be well short of saturating even a shoddy PCI implementation > (which is usually capable of at least 60MBytes/sec) > > > Have you done any raw performance checks on your existing drive > combination ?
mickey:~# hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 1724 MB in 2.00 seconds = 863.67 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 142 MB in 3.02 seconds = 46.95 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device mickey:~# hdparm -Tt /dev/sdb /dev/sdb: Timing cached reads: 1864 MB in 2.00 seconds = 931.94 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device Timing buffered disk reads: 160 MB in 3.02 seconds = 52.98 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device > > What errors are you seeing in the system logs from ivtv ? No errors > Could it be bad signal causing frame drops ? A bad cable signal ? I don't think so, i have a sharp picture on all three tuners. > > > To isolate the nvidia card from the mix, you could start your machine in > text-only mode (and never load the nvidia kernel support module). Try > capturing from the command line and see if you still get frame drops. Trying that next. when i did cat /dev/video > /tmp/video yesterday (for all three tuners) my system froze. thanks Chris > > > Cheers, > > Mark > > _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
