Grant Coady wrote:
Hi there,
A new 'old' box, with near 3:1 hdparm -Tt /dev/hda performance drop
comparing 2.4.31 with 2.6.11.12. pII/266 on 440LX chipset. HDD set
to udma2 (max for h/w) with manuf. utility. Single master on ribbon.
CDROM on other ribbon. Two runs each via ssh login soon after boot:
I see this problem too with i430TX chipset (the south bridge and thus
IDE controller is the same as in i440LX/EX and BX/ZX).
2.6.12-rc5:
/dev/hda:
Timing cached reads: 180 MB in 2.02 seconds = 89.11 MB/sec
Timing buffered disk reads: 40 MB in 3.09 seconds = 12.94 MB/sec
2.4.31:
/dev/hda:
Timing cached reads: 180 MB in 2.03 seconds = 88.67 MB/sec
Timing buffered disk reads: 62 MB in 3.01 seconds = 20.60 MB/sec
I also noticed that during the buffered read test on 2.6 kernel, the IDE
activity LED is blinking (so the drive is not 100% utilised) while it's
permanently on with 2.4.
Linux 2.4.31-si.
root@silly:~# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 344 MB in 1.99 seconds = 172.86 MB/sec
Timing buffered disk reads: 68 MB in 3.02 seconds = 22.52 MB/sec
root@silly:~# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 356 MB in 2.00 seconds = 178.00 MB/sec
Timing buffered disk reads: 68 MB in 3.04 seconds = 22.37 MB/sec
root@silly:~#
Linux 2.6.11.12a.
root@silly:~# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 340 MB in 2.01 seconds = 168.76 MB/sec
Timing buffered disk reads: 26 MB in 3.02 seconds = 8.60 MB/sec
root@silly:~# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 340 MB in 2.01 seconds = 169.26 MB/sec
Timing buffered disk reads: 26 MB in 3.02 seconds = 8.61 MB/sec
root@silly:~#
Hardware info, configs, etc at http://scatter.mine.nu/test/boxen/silly/
--Grant.
--
Ondrej Zary
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