On Thu, 26 Jan 2006, Chip Coldwell wrote:
then again with direct I/O RHEL4# time dd if=/dev/nst0 of=/dev/null bs=32k 31250+0 records in 31250+0 records out real 2m30.687s user 0m0.063s sys 0m0.677s So in this case, performance is no worse or better with direct I/O than without.
I tried it again with direct I/O and an even larger block size, but the time is the same: RHEL4# time dd if=/dev/nst0 of=/dev/null bs=64k 15625+0 records in 15625+0 records out real 2m30.153s user 0m0.025s sys 0m0.452s Chip -- Charles M. "Chip" Coldwell Senior Software Engineer Red Hat, Inc - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
