Hello
Darin Strait (<[EMAIL PROTECTED]>) wrote:
> I'm troubleshooting something that has been bugging me for a while...
>
> Why does my drive seem to run only in UDMA2 and only do about 19.50
> MB/s, according to hdparm? Everyone else always seems to have a faster
> drive than me, so I'm assuming that I'm misconfiguring something and
> it's not my hardware.
>
> I have fiddled with idebus=66 in my grub menu.lst, but it has never
> seemed to have an effect.
Please don't change that parameter if you don't really know what it
does. idebus is the speed in Mhz that the IDE bus uses. This has
nothing to do with ATA33 or ATA66. The ATA numbers name the theoretical
data throughput in MB/s. Unless you use some server mainboard your
system very probably only supports a bus speed of 33 MHz.
> I have an i810e motherboard and I'm running 2.6.2 (other kernel
> versions have had similar results). I have a Western Digital WD1200BB
> drive, the specs are as follows:
>
> [...]
> - Mode 5 Ultra ATA 100.0 MB/s
> [...]
> - Mode 2 multi-word DMA 16.6 MB/s
>
> kiyone:/home/dstrait# hdparm -ivtT /dev/hda
>
> /dev/hda:
> [...]
> using_dma = 1 (on)
>
> Model=WDC WD1200BB-00CAA1, FwRev=17.07W17, SerialNo=WD-WMA8C2112585
> [...]
> DMA modes: mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 *udma2
> [...]
> * signifies the current active mode
No. It signifies the mode that is used /if/ DMA is activated. If you
switch of DMA it will still tell you *udma2.
> Timing buffer-cache reads: 288 MB in 2.02 seconds = 142.31 MB/sec
> Timing buffered disk reads: 58 MB in 3.01 seconds = 19.27 MB/sec
My guess: wrong type of cable. Make sure it can do more that udma2.
best regards
Andreas Janssen
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Andreas Janssen
[EMAIL PROTECTED]
PGP-Key-ID: 0xDC801674
Registered Linux User #267976
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