Albert Chin wrote:
Why can't the NFS performance match that of SSH?
One big reason is that the sending CPU has to do all the comparisons to compute the list of files to be sent - it has to fetch the attributes from both local and remote and compare timestamps. With ssh, local processes at each end do lstat() calls in parallel and chatter about the timestamps, and the lstat() calls are much cheaper. I would wonder how long the attr-chatter takes in your two cases before bulk data starts to be sent - deducting that should reduce the imbalance you're seeing. If rsync were more multi-threaded and could manage multiple lstat() calls in parallel NFS would be closer. Rob T _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
