kormoc kormoc # lspci -v
03:05.0 RAID bus controller: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID (rev 01)
        Subsystem: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID
        Flags: bus master, medium devsel, latency 32, IRQ 7
        I/O ports at b400 [size=16]
        Memory at feadfff0 (32-bit, non-prefetchable) [size=16]
        Memory at fe000000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at cff20000 [disabled] [size=64K]
        Capabilities: [40] Power Management version 1
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  106 MB in  3.02 seconds =  35.12 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   94 MB in  3.04 seconds =  30.90 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   98 MB in  3.01 seconds =  32.55 MB/sec
kormoc kormoc # setpci -v -s 03:05.0 latency_timer=40
03:05.0:0d 40
kormoc kormoc # lspci -v
03:05.0 RAID bus controller: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID (rev 01)
        Subsystem: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID
        Flags: bus master, medium devsel, latency 64, IRQ 7
        I/O ports at b400 [size=16]
        Memory at feadfff0 (32-bit, non-prefetchable) [size=16]
        Memory at fe000000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at cff20000 [disabled] [size=64K]
        Capabilities: [40] Power Management version 1
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   84 MB in  3.01 seconds =  27.93 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   92 MB in  3.15 seconds =  29.21 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   98 MB in  3.04 seconds =  32.25 MB/sec
kormoc kormoc # setpci -v -s 03:05.0 latency_timer=80
03:05.0:0d 80
kormoc kormoc # lspci -v
03:05.0 RAID bus controller: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID (rev 01)
        Subsystem: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID
        Flags: bus master, medium devsel, latency 128, IRQ 7
        I/O ports at b400 [size=16]
        Memory at feadfff0 (32-bit, non-prefetchable) [size=16]
        Memory at fe000000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at cff20000 [disabled] [size=64K]
        Capabilities: [40] Power Management version 1
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   88 MB in  3.12 seconds =  28.19 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:  108 MB in  3.02 seconds =  35.77 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   98 MB in  3.03 seconds =  32.29 MB/sec
kormoc kormoc # setpci -v -s 03:05.0 latency_timer=ff
03:05.0:0d ff
kormoc kormoc # lspci -v
03:05.0 RAID bus controller: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID (rev 01)
        Subsystem: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID
        Flags: bus master, medium devsel, latency 248, IRQ 7
        I/O ports at b400 [size=16]
        Memory at feadfff0 (32-bit, non-prefetchable) [size=16]
        Memory at fe000000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at cff20000 [disabled] [size=64K]
        Capabilities: [40] Power Management version 1
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   96 MB in  3.05 seconds =  31.51 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   90 MB in  3.01 seconds =  29.87 MB/sec
kormoc kormoc # hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads:   94 MB in  3.06 seconds =  30.72 MB/sec