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Subject2.4.13-ac8 vs. 2.4.15-pre1 VIA IDE tests
Disk reads on my box have always hovered around ~5.x MB/sec with
kernels <= 2.4.13-ac8. I'm curious what resulted to the big
difference in hdparm results below. Both kernels were compiled
with the same configs.

2.4.13-ac8:

Timing buffer-cache reads: 128 MB in 2.62 seconds = 48.85 MB/sec
Timing buffered disk reads: 64 MB in 11.73 seconds = 5.46 MB/sec

Timing buffer-cache reads: 128 MB in 2.65 seconds = 48.30 MB/sec
Timing buffered disk reads: 64 MB in 11.75 seconds = 5.45 MB/sec

2.4.15-pre1:

Timing buffer-cache reads: 128 MB in 2.49 seconds = 51.41 MB/sec
Timing buffered disk reads: 64 MB in 4.70 seconds = 13.62 MB/sec

Timing buffer-cache reads: 128 MB in 2.53 seconds = 50.59 MB/sec
Timing buffered disk reads: 64 MB in 4.84 seconds = 13.22 MB/sec

# lspci -vvvxxx
[...]
00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 10) (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 d000 [size=16]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: 06 11 71 05 07 00 90 02 10 8a 01 01 00 40 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 01 d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 c0 00 00 00 00 00 00 00 ff 00 00 00
40: 03 e2 08 3a 6c 13 c0 00 20 20 a8 20 30 00 20 20
50: 0f 07 0b e0 04 00 00 00 a8 a8 a8 a8 00 00 00 00
60: 00 02 00 00 00 00 00 00 00 02 00 00 00 00 00 00
70: 02 01 00 00 00 00 00 00 02 01 00 00 00 00 00 00

80: 00 20 5f 01 00 00 00 00 00 00 00 00 00 00 00 00 <<== 2.4.13-ac8

80: 00 c0 73 0f 00 00 00 00 00 00 00 00 00 00 00 00 <<== 2.4.15-pre1

90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 01 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 10 00 71 05 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# hdparm /dev/hda
multcount = 0 (off)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 2434/255/63, sectors = 39102336, start = 0

# hdparm -i /dev/hda
Model=ST320413A, FwRev=3.39, SerialNo=7ED05MNS
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=39102336
IORDY=on/off, tPIO={min:240,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
AdvancedPM=no
Drive Supports : Reserved : ATA-1 ATA-2 ATA-3 ATA-4

# cat /proc/ide/via
----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.29
South Bridge: VIA vt82c686a
Revision: ISA 0x22 IDE 0x10
Highest DMA rate: UDMA66
BM-DMA base: 0xd000
PCI clock: 33MHz
Master Read Cycle IRDY: 1ws
Master Write Cycle IRDY: 1ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: yes yes
Post Write Buffer: yes no
Enabled: yes yes
Simplex only: no no
Cable Type: 80w 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode: UDMA DMA DMA DMA
Address Setup: 30ns 120ns 30ns 30ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 330ns 90ns 90ns
Data Recovery: 30ns 270ns 30ns 30ns
Cycle Time: 30ns 600ns 120ns 120ns
Transfer Rate: 66.0MB/s 3.3MB/s 16.5MB/s 16.5MB/s

--
.--. Michael J. Maravillo office://+63.2.894.3592/
( () ) Q Linux Solutions, Inc. mobile://+63.917.897.0919/
`--\\ A Philippine Open Source Solutions Co. http://www.q-linux.com/
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