Hi, > > Now, reading from the disk seems to work perfectly, but writing > > (dding /dev/zero to the block device) causes DMA timeouts every > > few hundred megabytes - in between the timeouts, though, > > throughput seems to be ok (~ 20 MB/s). > > > > Once the fallback mechanism has switched back to PIO4, things seem > > to work perfectly, albeit slowly :-) > > FYI: I just tried forcing the device to MWDMA2, and that seems to work > well, too - wrote some 10 GB without any errors. Yet another piece of information: Writing in 4 KiB or 8 KiB blocks in UDMA/66 mode (using dd if=/dev/zero of=/dev/sdc bs=4k oflag=direct) seems to work well, too, 16 KiB causes the problems described. Florian -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
