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SubjectRe: problems with I/O performance with 2.4.12-ac3
Hi,
On my machine HDD is slow with all ac-kernels I've tried so far.
There is even more simple test -- hdparm.

2.4.12-ac3:
# hdparm -tT /dev/hda
/dev/hda:
Timing buffer-cache reads: 128 MB in 0.70 seconds =182.86 MB/sec
Timing buffered disk reads: 64 MB in 2.88 seconds = 22.22 MB/sec

2.4.13-pre3:
# hdparm -tT /dev/hda
/dev/hda
Timing buffer-cache reads: 128 MB in 0.63 seconds =203.00 MB/sec
Timing buffered disk reads: 64 MB in 1.57 seconds = 40.76 MB/sec

Same config options in both kernels. Same hardware.

# hdparm /dev/hda
/dev/hda:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 1 (on)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4865/255/63, sectors = 78165360, start = 0

This is on Athlon-1.4Ghz, chipset amd761/via8231,
IDE Seagate Barracuda ATA-IV ST340016A 40G.
Can somebody explain such results?

--

DV
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