Hi !
I'm doing an internship in a research lab, and we are trying to use a P.ATA SSD
in order to speed-up a genome computation software.
We got a performance problem, expecially with access time : access time is about
800us, and according to the manufacturer it should be about 40us. The bandwith
is OK.
The SSD is a 2.5' flash hard drive, the slave of the first IDE channel.
We wonder if that could be the because P.ATA driver is not really done for small
access times, so we got such a poor time. In that case, I guess we would have to
have a closer look at the driver ...
We are also going to do some tests with the SSD on a windows computer, maybe
that's a problem with the firmware of the SSD ...
Thank you for your help !
Here are some details about the configuration.
[rootlav@remix lavenier]# /sbin/hdparm -i /dev/hdb
/dev/hdb:
Model=M-Systems FFD ULTRA ATA, FwRev=1.13, SerialNo=515240001
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=0kB, MaxMultSect=2, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=128817152
IORDY=yes, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 1:
* signifies the current active mode
The computer is a DELL precision360 P4 3Ghz
Hard drives : sda SCSI 67MB, hda 80MB, hdb 67MB (the SSD)
OS : Linux Fedora 2 : 2.6.6-1
The drive is a M-Systems 2,5' FFD ultra-ata flash disk (complies with ATA-6)
http://www.m-systems.com/site/en-US/
3.3. Characteristics
3.3.1. ATA Modes
The Ultra ATA supports the following ATA modes:
• PIO mode 0, 1, 2, 3, 4
• DMA mode 0, 1, 2
• Ultra DMA mode 0, 1, 2, 3, 4, 5
3.3.2. Burst Read/Write Performance
The Ultra ATA burst read/write rate is 100 MB/sec.
3.3.3. Sustained Read/Write Performance
The Ultra ATA meets the performance requirements specified in Table 1.
Performance was measured on a computer using the following setup:
• Capacity: 4GB
• Configuration: Ultra DMA Mode 5, with 128K blocks aligned on 128K boundaries
• Platform: ASUS P4T533-C with Intel 2.4 GHz
• Testing utilities:
o H2Bench (DOS)
o H2benchW (Windows XP)
Table 1: FFD 2.5” Ultra ATA Ultra DMA Mode 5 Transfer Rates
Operation
Burst Rate1 (MB/sec)
Sustained2 Rate 128KBs Blocks (MB/sec)
Read
100.0
45.0
Write
100.0
40.0
3.3.4. Access Time
Maximum access time for the Ultra ATA is < 0.04 msec.
3.3.5. Seek Time
The Ultra ATA has no seek time.
3.3.6. Memory Capacity
Ultra ATA memory capacity information is described in Table 2.
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