Mike Snitzer <snitzer@xxxxxxxxxx> writes: > Jens and/or Jeff Moyer, are there any knobs that you'd suggest to try to > promote request merging on a really fast block device? Any scheduler > and knobs you'd suggest would be appreciated. There's a small chance that CFQ does what you want. It has logic to detect when multiple processes are submitting interleaved I/O, and it will try to wait until requests are merged before dispatching (see the comment in cfq_rq_enqueued). Aside from that, make sure /sys/block/<dev>/queue/rotational is set to 1. Cheers, Jeff -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
