COMSTAR Multilink Performance Fail
Whenever a multilink configuration is used with COMSTAR, maximum performance falls to 150MB/s or less, particularly with reads. This has been verified with both SRP/Infiniband, multi-1G ethernet/iSCSI, and multi-10G/iSCSI. NFS works correctly (albeit without multilink) in in all cases.
See the "ixgbe driver, Lindsay Lohan, and the Greek economy" Illumos Developer thread for more details.
The most recent test results with SRP/20G Infiniband are:
2x 20G Multilink:
162MB/s Read (poor read rate)
139MB/s Write (rough maximum write rate)
1x 20G Unilink:
683 MB/s Read