I've make a test with dd command:
# time dd if=/dev/zero of=./8gbfile bs=1024k count=8192
8192+0 records in
8192+0 records out
8589934592 bytes transferred in 155.653213 secs (55186362 bytes/sec)
0.007u 25.129s 2:35.69 16.1% 55+6039k 117+68628io 0pf+0w
in other terminal i ran iostat while dd were running and I get this:
# iostat -I 1
tty da0 pass0 cpu
tin tout KB/t xfrs MB KB/t xfrs MB us ni sy in id
1 61 25.23 52958 1305.07 0.00 0 0.00 0 0 8 0 91
0 184 127.48 434 54.03 0.00 0 0.00 0 0 5 0 95
0 61 127.49 440 54.78 0.00 0 0.00 0 0 5 0 95
0 61 127.75 445 55.52 0.00 0 0.00 0 0 5 0 95
0 61 127.49 442 55.03 0.00 0 0.00 0 0 4 0 96
0 61 127.49 436 54.28 0.00 0 0.00 0 0 5 0 95
0 61 125.27 425 51.99 0.00 0 0.00 0 0 5 1 94
0 61 118.14 393 45.34 0.00 0 0.00 0 0 3 0 97
average 54MB/s with or without hw.mpt.enable_sata_wc seted in loader.conf file.
is it a normal speed for this adapter?!
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Att.
Lutieri G. B.