More ATA100 oddity

I just noticed something odd. (I'm using 2.4.3-ac9 on an ASUS A7V, Athlon 1000 mHz)

(1) As noted in other messages, my machine boots up the Promise chipset as UDMA(100)

hde: 80041248 sectors (40981 MB) w/2048KiB Cache, CHS=79406/16/63, UDMA(100)

(2) hdparm recognizes it as UDMA5 with 27 MB/sec speed

/dev/hde:

Model=Maxtor 54098H8, FwRev=DAC10SC0, SerialNo=K80EP5NC Config={ Fixed } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16,MultSect=off CurCHS=16383/16/63, CurSects=16514064, LBA=yes,LBAsects=80041248 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 udma0 udma1 udma2 udma3 udma4 *udma5 Timing buffered disk reads: 64 MB in 2.31 seconds = 27.71 MB/sec

(3) /proc/ide/pdc202xx sees it as UDMA 4

                                PDC20265 Chipset.
------------------------------- General Status ---------------------------------
Burst Mode                           : enabled
Host Mode                            : Normal
Bus Clocking                         : 33 PCI Internal
IO pad select                        : 10 mA
Status Polling Period                : 1

Interrupt Check Status Polling Delay : 2
--------------- Primary Channel ---------------- Secondary Channel -------------
enabled enabled
66 Clocking enabled disabled
Mode PCI Mode PCI
FIFO Empty FIFO Empty
--------------- drive0 --------- drive1 -------- drive0---------- drive1 ------

DMA enabled:    yes              no              no             no
DMA Mode:       UDMA 4           NOTSET          NOTSET         NOTSET
PIO Mode:       PIO 4            NOTSET           NOTSET        NOTSET

Oh, and by the way, ACPI support has never powered off this machine. Ever. But I use apm and I'm happy.

-Nick

**********************************************************
Nicholas Petreley   Caldera Systems - LinuxWorld/InfoWorld
[email protected] - http://www.petreley.com - Eph 6:12
**********************************************************
.

udma 5 is ata100 udma4 is 66 so it's seeing your disk fine...

as far as the 27MB/s goes, it actually testing the disk and that's what it got for throughput... that's acutally a pretty good number, on the diamondmax 80 I get 23MB/s

/dev/hde:

Model=Maxtor 98196H8, FwRev=ZAH814Y0, SerialNo=V80H9YCC Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=off CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=160086528 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 udma0 udma1 *udma2 udma3 udma4 udma5

/dev/hde:
Timing buffered disk reads: 64 MB in 2.77 seconds = 23.10 MB/sec

using promise ultra-100

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