root@openindiana:/tmp# zfs send -R tank@1 | /opt/csw/bin/amd64/mbuffer -s 128k -m 2G -o -| zfs receive -F tank2
in @ 3328 KiB/s, out @  0.0 KiB/s, 2086 GiB total, buffer   9% fullcannot receive new filesystem stream: invalid backup stream
mbuffer: error: outputThread: error writing to <stdout> at offset 0x2098e720000: Broken pipe

summary: 2086 GiByte in 14 h 27 min 41.1 MiB/s
mbuffer: warning: error during output to <stdout>: Broken pipe