[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


 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

 * signifies the current active mode

And here is the benchmark.
# hdparm -tT /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

 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

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