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SubjectRe: 2.4 disk speed 66% slowdown...
Benson Chow wrote:

> Just as a datapoint, my Via IDE chipset (on atb850/kt133) and Promise
> Ultra66 (on 2xpp200/82440FX/PIIX3) works fine with 2.4.0, getting speeds
> about correct:


> Model=QUANTUM FIREBALLP LM30, FwRev=A35.0700
> [snip. unused info cut]
> tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
> IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
> UDMA modes: mode0 mode1 mode2 mode3 *mode4
> Timing buffered disk reads: 64 MB in 4.30 seconds = 14.88 MB/sec
> Timing buffered disk reads: 64 MB in 4.34 seconds = 14.75 MB/sec


I have the same drive, but "hdparm -i" gives different output:

Model=QUANTUM FIREBALLP LM30, FwRev=A35.0700, SerialNo=186006831114
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
BuffType=DualPortCache, BuffSize=1900kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=58633344
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

There is no mention of "UDMA modes."

However, my throughput seems to be much faster than yours for some reason:

Timing buffer-cache reads: 128 MB in 0.91 seconds =140.66 MB/sec
Timing buffered disk reads: 64 MB in 2.49 seconds = 25.70 MB/sec

My machine is an Athlon (booting says "Detected 848.381 MHz processor").
I'm not sure what the system bus speed is, but I think it's ~100MHz.

00:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] AGP
Bridge (rev 01) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: fca00000-feafffff
Prefetchable memory behind bridge: e4800000-f48fffff
BridgeCtl: Parity- SERR+ NoISA- VGA+ MAbort- >Reset- FastB2B-

00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-756 [Viper] IDE
(rev 03) (prog-if 8a [Master SecP PriP])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 64
Region 4: I/O ports at cb00 [size=16]




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