Messages in this thread | | | Date | Thu, 16 Feb 2006 13:42:27 +0300 | From | Michael Tokarev <> | Subject | Re: readahead logic and I/O errors |
| |
Jan Knutar wrote: > On Wednesday 15 February 2006 22:35, Michael Tokarev wrote: > > >>after FIRST I/O error, linux continued trying reading-ahead, >>discovering more and more failed blocks, as dmesg said. > > Sorry for hijacking the thread, but on another note, is there > anyway to tell linux to tell the drive to not bother retrying > read errors? Would be perfect for streaming video from a > CD or DVD. Usually video players have excellent error > recovery themselves, which probably looks better on the > screen than the movie coming to a grinding halt due to > the retries.
It looks like exactly the same issue. When you set readahead for the drive to 0 (to disable it), the only retry which is done is the one by drive itself. Linux return I/O error to the application right when drive tells so, and it's up to the application to descide what to do next - abort (like `cp' does), or continue next (or next-to-next) sector etc. I don't know how to control retries in the drive (if it's at all possible).
/mjt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |