Slow Kodi read speed from ISCSI LUN

Ok, I’ll try again.

Kodi stutters and buffers consistently when playing media from iSCSI LUN (iSCSI LUN attached to pi3 with open-iscsi). Using ssh & nload I can see that the pi3 reads at between 300kbps-2mbits from iSCSI LUN when playing media. When I read/write files via OS, I get consistent 100mbits.

How can I make Kodi use the full bandwidth?