performance with LSI SAS 1064

[Lutieri G.]

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?!


-- 
Att.
Lutieri G. B.