Don Baccus <dhogaza@pacifier.com> writes:
> If Tom's system is IDE-based and he's not explicitly enabled DMA then
> this alone would explain the difference you two are seeing,
It is IDE, but DMA is on:
[root@rh1 root]# hdparm -v /dev/hda
/dev/hda:multcount = 16 (on)I/O support = 0 (default 16-bit)unmaskirq = 0 (off)using_dma = 1
(on)keepsettings= 0 (off)nowerr = 0 (off)readonly = 0 (off)readahead = 8 (on)geometry =
9729/255/63,sectors = 156301488, start = 0
[root@rh1 root]# hdparm -i /dev/hda
/dev/hda:
Model=ST380021A, FwRev=3.10, SerialNo=3HV0CZ2LConfig={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5%
}RawCHS=16383/16/63,TrkSize=0, SectSize=0, ECCbytes=4BuffType=unknown, BuffSize=2048kB, MaxMultSect=16,
MultSect=16CurCHS=16383/16/63,CurSects=-66060037, LBA=yes, LBAsects=156301488IORDY=on/off, tPIO={min:240,w/IORDY:120},
tDMA={min:120,rec:120}PIOmodes: pio0 pio1 pio2 pio3 pio4DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4
*udma5AdvancedPM=noDriveSupports : Reserved : ATA-1 ATA-2 ATA-3 ATA-4 ATA-5
This is an out-of-the-box RH 7.2 install (kernel 2.4.7-10) on recent
Dell hardware. If anyone can suggest further tuning of the hdparm
settings, I'm all ears. Don't know a darn thing about disk tuning
for Linux.
regards, tom lane
