Eric Jorgensen wrote: > > Justin Schoeman wrote: > > > > 1) I use reserfs on all my partitions, but I have not benchmarked it > > against ext2 (or any of the others). On my Athlon 600, I get 13MByte/s > > to disk without any problems (system load is around 12%). The raw disk > > can maintain 28MB/s, but I think the real bottleneck is the PCI bus, not > > the fs. > > Say what? 32-bit 33mhz PCI has about 132 megabytes (not bits, bytes) > per second bandwidth. A TV card needs at most 1/4th of that. If the raw > i/o capability of your harddrive is 28MB/sec, it needs less than 1/4th > of that. Even accounting for overhead, and assuming you are running at > the hardware speeds of your capture card and hard disk, more than half > of the pci bandwidth wouldn't get utilized. > > - Eric Well, you have: 1) capture card to main memory = 13MB/s 2) main memory to HDD = 13MB/s 3) other access (screen updates, etc.) For a total of just over 26MB/s - the rest is consumed by bus arbitration/contention/etc. Most desktop chipsets are not very effiecient, and with multiple devices accessing the PCI bus they max out at _much_ less than the theoretical maximum... Unfortunate, but it happens. -justin
