Messages in this thread | | | Date | Mon, 13 Jun 2005 12:43:46 +0200 | From | Ondrej Zary <> | Subject | Re: Odd IDE performance drop 2.4 vs 2.6? |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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