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SubjectRe: 2.4 disk speed 66% slowdown...
Mine was actually out of a stock 2.2.17 -- I tried your patch in an attempt
to fix a disk problem - but the disk was just going bad and the slow speeds were
coming from the automatic sector remapping.

pardon my ignorance, but where do you get UDMA-100-66?

Here is the hdparm -i output on 2.4:


Model=IBM-DARA-225000, FwRev=SHAOA54A, SerialNo=SQASQ202564
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=3(DualPortCache), BuffSize=418kB, MaxMultSect=16, MultSect=off
DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=2
CurCHS=17475/15/63, CurSects=16513875, LBA=yes, LBAsects=49577472
tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
IORDY=on/off, tPIO={min:240,w/IORDY:120}, PIO modes: mode3 mode4
UDMA modes: mode0 mode1 *mode2 mode3 mode4
Drive Supports : ATA/ATAPI-4 T13 1153D revision 17 : ATA-1 ATA-2 ATA-3 ATA-4

UDMA mode (2) seems to be identical to before.

Andre Hedrick wrote:
> On Tue, 23 Jan 2001, Florin Andrei wrote:
> > Linda Walsh wrote:
> > >
> > > The REAL problem was in disk performance. The apm made no difference:
> >
> > Same problem here. I had a huge HDD performance drop when upgrading
> > from 2.2.18 to 2.4.0
> > It's an Intel i815 motherboard, and the HDD is Ultra-ATA.
> ER, were you getting UDMA-100-66 out of 2.2.18 stock?
> Now what are you getting in 2.4.0?

Linda A Walsh | Trust Technology, Core Linux, SGI | Voice: (650) 933-5338
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