Hi Nikhil,
On Fri, 10 Aug 2012, Nikhil Sethi (निखिल सेठी) wrote:
I am wondering what kind of disk speed to expect on net6501.
I get pretty low from non-ssd disk and I think I might have the kernel
mis-configured.
sda is a mini-pcie ssd, sdb is 2.5" 5400 RPM SATA.
net6501 ~ # uname -a
Linux net6501 3.5.1-net6501-1 #7 SMP Thu Aug 9 23:37:33 PDT 2012
x86_64 Genuine Intel(R) CPU @ 1.00GHz GenuineIntel GNU/Linux
net6501 ~ # hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 864 MB in 2.00 seconds = 432.14 MB/sec
Timing buffered disk reads: 80 MB in 3.03 seconds = 26.42 MB/sec
That doesn't sound ridiculous for a 5400 rpm disk. I'm running modified
(reconfigured) standard Debian 3.2.20 kernel with a few local patches
(watchdog and leds support) and get much better speed on the SATA port.
root@net6501:~# uname -a
Linux net6501.ischool.zm 3.2.20-cw-net6501-120810-1 #20 SMP Fri Aug 10
22:47:31 CAT 2012 i686 GNU/Linux
root@net6501:~# hdparm -tTi /dev/sda
/dev/sda:
Model=OCZ-SOLID3, FwRev=2.15, SerialNo=OCZ-3M3BH2OV9179YF64
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=234441648
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=yes: unknown setting WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-2,3,4,5,6,7
* signifies the current active mode
Timing cached reads: 794 MB in 2.00 seconds = 397.00 MB/sec
Timing buffered disk reads: 352 MB in 3.00 seconds = 117.33 MB/sec
I get slightly better results with the stock Debian kernel
3.2.0-0.bpo.2-486:
Timing cached reads: 818 MB in 2.00 seconds = 408.97 MB/sec
Timing buffered disk reads: 394 MB in 3.00 seconds = 131.33 MB/sec
Hope this helps, Chris.
--
Aptivate | http://www.aptivate.org | Phone: +44 1223 967 838
Future Business, Cam City FC, Milton Rd, Cambridge, CB4 1UY, UK
Aptivate is a not-for-profit company registered in England and Wales
with company number 04980791.
_______________________________________________
Soekris-tech mailing list
Soekris-tech@lists.soekris.com
http://lists.soekris.com/mailman/listinfo/soekris-tech
