Messages in this thread | | | Date | Fri, 17 Jun 2005 15:43:32 +0200 | From | Ondrej Zary <> | Subject | Re: Odd IDE performance drop 2.4 vs 2.6? |
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Alan Cox wrote: > On Mer, 2005-06-15 at 20:15, Ondrej Zary wrote: > >>Now I've tested it with preempt disabled and nothing has changed. When >>fiddling around with hdparm, I got about 16MB/s max. with 2.6.12-rc5. >>With 2.4.31, I got about 21MB/s when just the DMA was enabled >>(read-ahead and multcount set to 0 - changing them does not make almost >>any difference). > > > multcount is only used for PIO so that would be expected. Similarly the > block readahead should matter but not anything drive level. > > If you compare the hdparm data are both 2.4 and 2.6 selecting the same > IDE modes ?
This is in my init scripts: /usr/sbin/hdparm -u1c1k1 /dev/hda /dev/hdc /dev/hdd 1> /dev/null It selects UDMA2 mode in both 2.4 and 2.6.
hdparm -i /dev/hda shows exactly the same output in both 2.4 and 2.6:
/dev/hda:
Model=WDC WD300BB-00AUA1, FwRev=18.20D18, SerialNo=WD-WMA6W1847372 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16 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 UDMA modes: udma0 udma1 *udma2 AdvancedPM=no WriteCache=enabled Drive conforms to: device does not report version:
* signifies the current active mode
-- Ondrej Zary
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