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SubjectRe: Identifying/activating faster ATAxx modes (WAS kernel config tale of woe)
>> /dev/hda:
>>
>> Model=Maxtor 6E030L0, FwRev=NAR61590, SerialNo=E106SZLE
>> Config={ Fixed }
>> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
>> BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
>> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=60058656
>> 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: disabled (255) WriteCache=enabled
>> Drive conforms to: (null): 1 2 3 4 5 6 7
>>
>> Output from hdparm -tT
>>
>> /dev/hda:
>> Timing buffer-cache reads: 128 MB in 0.44 seconds =290.91 MB/sec
>> Timing buffered disk reads: 64 MB in 8.11 seconds = 7.89 MB/sec
>
> This is weird. Your disk seems to be set up for udma6 (UATA133),
> which should provide for transfer rates of at least 40MiB/s.

Dennis,

you have a VIA kt8235 Southbrigde?
You need kernel >= 2.4.20-rc2, to get UDMA working with that chipset.
Of course, as Tomas pointed out, latest ac has much more ide improvements, so
it probably would do even better with kt8235.

But >= 2.4.20-rc2 works like a charm here for me with the via kt8235.

Christian

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