[mythtv-users] How much horespower for frontend?
John Drescher
drescherjm at gmail.com
Thu Sep 28 01:46:53 UTC 2006
>
> I've been loosely following this, not reading all the details, so
> forgive me if I'm repeating or stating the obvious...
>
> Have you checked your BIOS settings to make sure access to these IDE
> devices is UDMA mode, not PIO? Are the IDE cables you're using the
> older 40-wire style or the newer 80-wire? See
> http://www.pcguide.com/ref/hdd/if/ide/confCable80-c.html for info on
> the difference.
>
hdparm -i /dev/hda
will answer this question. Here is an example of a 3 year old 40 gb ide
drive on my dual processor opteron 850
# hdparm -i /dev/hda
/dev/hda:
Model=WDC WD400JB-00ENA0, FwRev=05.03E05, SerialNo=WD-WCAD18755665
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78165360
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
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3
ATA/ATAPI-4 ATA/ATAPI-5
* signifies the current active mode
And here is the benchmark.
# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 3420 MB in 2.00 seconds = 1710.47 MB/sec
Timing buffered disk reads: 140 MB in 3.01 seconds = 46.47 MB/sec
Now compare that to a 6 month old sata2 disk:
# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 3008 MB in 2.00 seconds = 1504.51 MB/sec
Timing buffered disk reads: 230 MB in 3.02 seconds = 76.15 MB/sec
John
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