hi list,
I checked my moblin2 bootchart and found the maximum disk throughput
is only 8MB/s,
However I got 25.21 MB/sec if I test with hdparm -tT /dev/sda.
Why the number is so much different between bootchart and hdparm test?
Below shows my disk information:
-bash-3.2# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 756 MB in 2.00 seconds = 378.02 MB/sec
Timing buffered disk reads: 76 MB in 3.01 seconds = 25.21 MB/sec
-bash-3.2#
-bash-3.2# hdparm -i /dev/sda
/dev/sda:
Model=TOSHIBA MK8009GAH , FwRev=BS011A ,
SerialNo= 38B3W2NBW
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16?
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=yes: unknown setting WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6
* signifies the current active mode
-bash-3.2# hdparm /dev/sda
/dev/sda:
IO_support = 0 (default)
16-bit)
HDIO_GET_UNMASKINTR failed: Inappropriate ioctl for device
HDIO_GET_DMA failed: Inappropriate ioctl for device
HDIO_GET_KEEPSETTINGS failed: Inappropriate ioctl for device
readonly = 0 (off)
readahead = 256 (on)
geometry = 9729/255/63, sectors = 156301488, start = 0
Regards,
Axel
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