Running OFED 1.4, and discovering targets with "iscsi_discovery <IP> -t iser -f -l" seems to perform great w/ one target (>1GB/s), but "iostat" on the target doesn't seem to show as much activity as the initiator claims, and testing more than one target drive simultaneously, the tgtd hangs. Using the default transport, "-t tcp" seems reliable with multiple targets simultaneously active, but the performance is slow (reported as <400MB/s on the initiators, and the targets show only 10% that performance... even though these devices together easily scale to many GB/s). The last time I gave iSer a try I noticed that the block sizes on the target were very small (compared to the user apps block sizes on the initiator). I'm seeing this again; so I tried the fix I found before (add O_DIRECT to the flags in the backed_file_open call in bs_rdwr_open), and that reduced the cached memory usage, but performance went down. I've got disks and IB that should be getting many GB/s performance, and I only see a fraction of that. Any hints on how to configure this to get decent performance? Thanks, Chris -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
