Toshiba SAS disk

[byhkaan]

Hi,

I have a dell perc h330 card runnig at HBA mode with TOSHIBA AL13SEB300 
series 10k sas drives.
These disk are running on ubuntu as expected defined from spec sheet 
,but at FreeBSD10 they are acting like limited to 20MB/s bandwidth. I 
also tried the mrsas driver instead of mfi but the results are same. Is 
anyone see the same problem ?

linux #
dd if=/dev/zero of=/dev/sdb bs=1M count=1000 oflag=dsync
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 11.0951 s, 94.5 MB/s

freebsd10 (FreeBSD 10.2-STABLE #2 r291926M) #
dd if=/dev/zero of=/dev/da4 bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 51.243550 secs (20462595 bytes/sec)

# camcontrol inquiry da4
pass4: <TOSHIBA AL13SEB300 DE0D> Fixed Direct Access SPC-4 SCSI device
pass4: Serial Number 15O0A0FOFRD6
pass4: 150.000MB/s transfers, Command Queueing Enabled

# diskinfo -vt da4
da4
         512             # sectorsize
         300000000000    # mediasize in bytes (279G)
         585937500       # mediasize in sectors
         0               # stripesize
         0               # stripeoffset
         9010            # Cylinders according to firmware.
         255             # Heads according to firmware.
         255             # Sectors according to firmware.
         15O0A0FOFRD6    # Disk ident.

Seek times:
         Full stroke:      250 iter in   2.790492 sec =   11.162 msec
         Half stroke:      250 iter in   1.870304 sec =    7.481 msec
         Quarter stroke:   500 iter in   3.109343 sec =    6.219 msec
         Short forward:    400 iter in   1.106922 sec =    2.767 msec
         Short backward:   400 iter in   1.412916 sec =    3.532 msec
         Seq outer:       2048 iter in   0.103199 sec =    0.050 msec
         Seq inner:       2048 iter in   0.104223 sec =    0.051 msec
Transfer rates:
         outside:       102400 kbytes in   0.530404 sec =   193060 
kbytes/sec
         middle:        102400 kbytes in   0.672639 sec =   152236 
kbytes/sec
         inside:        102400 kbytes in   0.853422 sec =   119988 
kbytes/sec


thanks,