centos 7.6 ZFS v0.6.5.11-1 10GB RAM block device
4k.read: IOPS=2705k, BW=10.3GiB/s (11.1GB/s)(160GiB/15504msec)
4k.write: IOPS=2114k, BW=8256MiB/s (8657MB/s)(160GiB/19845msec)
4k.randread: IOPS=2691k, BW=10.3GiB/s (11.0GB/s)(160GiB/15589msec)
4k.randwrite: IOPS=2054k, BW=8024MiB/s (8414MB/s)(157GiB/20002msec)
4k.70%read: IOPS=1545k, BW=6035MiB/s (6328MB/s)(112GiB/19004msec)
4k.30%write: IOPS=662k, BW=2586MiB/s (2712MB/s)(47.0GiB/19004msec)
centos 7.6 ZFS v0.6.5.11-1 zvol on 10GB RAM block device
4k.read: IOPS=289k, BW=1130MiB/s (1185MB/s)(22.1GiB/20002msec)
4k.write: IOPS=145k, BW=565MiB/s (593MB/s)(11.0GiB/20001msec)
4k.randread: IOPS=295k, BW=1153MiB/s (1209MB/s)(22.5GiB/20002msec)
4k.randwrite: IOPS=32.3k, BW=126MiB/s (132MB/s)(2523MiB/20020msec)
4k.70%read: IOPS=52.5k, BW=205MiB/s (215MB/s)(4102MiB/20002msec)
4k.30%write: IOPS=22.5k, BW=87.9MiB/s (92.2MB/s)(1759MiB/20002msec)
Ubuntu 18.04 ZFS v0.7.5-1ubuntu16.4 10GB ram block device
4k.read: IOPS=3653k, BW=13.9GiB/s (14.0GB/s)(160GiB/11482msec)
4k.write: IOPS=2730k, BW=10.4GiB/s (11.2GB/s)(160GiB/15365msec)
4k.randread: IOPS=3335k, BW=12.7GiB/s (13.7GB/s)(160GiB/12578msec)
4k.randwrite: IOPS=2535k, BW=9902MiB/s (10.4GB/s)(160GiB/16546msec)
4k.70%read: IOPS=2105k, BW=8221MiB/s (8620MB/s)(112GiB/13953msec)
4k.30%write: IOPS=902k, BW=3522MiB/s (3693MB/s)(47.0GiB/13953msec)
Ubuntu 18.04 ZFS v0.7.5-1ubuntu16.4 zvol on 10GB ram block device
4k.read: IOPS=213k, BW=833MiB/s (873MB/s)(16.3GiB/20003msec)
4k.write: IOPS=173k, BW=677MiB/s (710MB/s)(13.2GiB/20002msec)
4k.randread: IOPS=149k, BW=580MiB/s (609MB/s)(11.3GiB/20003msec)
4k.randwrite: IOPS=26.2k, BW=102MiB/s (107MB/s)(2051MiB/20069msec)
4k.70%read: IOPS=35.3k, BW=138MiB/s (145MB/s)(2759MiB/20008msec)
4k.30%write: IOPS=15.2k, BW=59.2MiB/s (62.1MB/s)(1185MiB/20008msec)
solaris 11.3 8G RAM block device
4k.read: io=752176KB, bw=4055.7MB/s, iops=1038.3K, runt= 20380msec
4k.write: io=469448KB, bw=2240.3MB/s, iops=573495 , runt= 20317msec
4k.randread: io=2855.4MB, bw=3188.4MB/s, iops=816206 , runt= 20166msec
4k.randwrite: io=4051.5MB, bw=1996.8MB/s, iops=511168 , runt= 20491msec
4k.70%read: io=4008.6MB, bw=1831.6MB/s, iops=468863 , runt= 20080msec
4k.30%write: io=3474.4MB, bw=803819KB/s, iops=200954 , runt= 20080msec
solaris 11.3 zvol on 8G RAM block device
4k.read: io=3364.2MB, bw=3848.9MB/s, iops=985301 , runt= 20030msec
4k.write: io=1627.2MB, bw=502717KB/s, iops=125679 , runt= 20001msec
4k.randread: io=3773.4MB, bw=2645.8MB/s, iops=677308 , runt= 20004msec
4k.randwrite: io=2176.6MB, bw=111147KB/s, iops=27786 , runt= 20052msec
4k.70%read: io=3159.5MB, bw=161229KB/s, iops=40307 , runt= 20066msec
4k.30%write: io=1354.9MB, bw=69140KB/s, iops=17284 , runt= 20066msec
proxmox kernel 4.15.18-9 | zfs 0.7.12-1 10GB ramdisk
4k.read: io=163840MB, bw=15796MB/s, iops=4043.9K, runt= 10372msec
4k.write: io=163840MB, bw=12245MB/s, iops=3134.8K, runt= 13380msec
4k.randread: io=163840MB, bw=14387MB/s, iops=3683.9K, runt= 11388msec
4k.randwrite: io=163840MB, bw=9229.1MB/s, iops=2362.9K, runt= 17751msec
4k.70%read: io=114704MB, bw=8526.1MB/s, iops=2182.9K, runt= 13452msec
4k.30%write: io=49136MB, bw=3652.7MB/s, iops=935084, runt= 13452msec
proxmox kernel 4.15.18-9 | zfs 0.7.12-1 10GB ramdisk zvol
4k.read: io=29757MB, bw=1487.8MB/s, iops=380854, runt= 20002msec
4k.write: io=16633MB, bw=851565KB/s, iops=212891, runt= 20001msec
4k.randread: io=20155MB, bw=1007.7MB/s, iops=257962, runt= 20002msec
4k.randwrite: io=2770.5MB, bw=141650KB/s, iops=35412, runt= 20028msec
4k.70%read: io=3539.2MB, bw=181123KB/s, iops=45280, runt= 20009msec
4k.30%write: io=1517.8MB, bw=77672KB/s, iops=19417, runt= 20009msec