The max_hw_sectors_kb was set at 4096KB. On the DDN I verified that the request
sizes where correct.
I haven tried larger max_hw_sectors_kb it had no effect. Setting the cmd_per_lun=1 improved reads
slightly but not much.
chas williams - CONTRACTOR wrote:
In message <[EMAIL PROTECTED]>,MAHMOUD HANAFI writes:
OFED Setup:
/sys/module/ib_srp/mellanox_workarounds = 1
/sys/module/ib_srp/refcnt = 11
/sys/module/ib_srp/srp_sg_tablesize = 256
/sys/module/ib_srp/topspin_workarounds = 1
/sys/block/sdd/queue/max_sectors_kb = 4096
/sys/block/sdd/queue/nr_requests = 8192
/sys/block/sdd/queue/read_ahead_kb = 128
what is the max_hw_sectors_kb for the ofed target? unless you specified
max_sect= during login, i suspect you are getting the system defaults.
typically this is 512 sectors i think, which is where your performance
seems to start to diverge.
--
Mahmoud Hanafi
Senior System Administrator
ASC/MSRC
www.asc.hpc.mil
2435 5th Street
WPAFB, OHIO 45433
(937) 255-1536
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