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SubjectRe: 2.4 disk speed 66% slowdown...
Just as a datapoint, my Via IDE chipset (on atb850/kt133) and Promise
Ultra66 (on 2xpp200/82440FX/PIIX3) works fine with 2.4.0, getting speeds
about correct:

Model=IBM-DTLA-307045, FwRev=TX6OA60A
[snip. unused info cut]
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5
Timing buffered disk reads: 64 MB in 1.78 seconds = 35.96 MB/sec
Timing buffered disk reads: 64 MB in 1.79 seconds = 35.75 MB/sec
Timing buffered disk reads: 64 MB in 1.79 seconds = 35.75 MB/sec

Model=QUANTUM FIREBALLP LM30, FwRev=A35.0700
[snip. unused info cut]
tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
UDMA modes: mode0 mode1 mode2 mode3 *mode4

Timing buffered disk reads: 64 MB in 4.30 seconds = 14.88 MB/sec
Timing buffered disk reads: 64 MB in 4.34 seconds = 14.75 MB/sec

Quite slow for the drive is capable of, but it's very fast for the
computer. All I care for that machine is it to be able to sustain a
100Mbit file transfer to it at near full speed :)

Some things I did notice is that sometimes I forget to mark down some of
the options (dma especially) while compiling the kernel - and this killed
my disk transfer rate...

(Also something weird: my Fujitsu just doesn't seem to want to get into
UDMA66 (stays in udma33) in linux, but its head read rate is maxed out at
19MB/sec anyway, so it doesn't matter. It's also on the same IDE channel
as the IBM on the Via. I really wonder why it's:

Model=FUJITSU MPD3137AH, FwRev=DH-05-09
[snip. unused info cut]
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4
Timing buffered disk reads: 64 MB in 3.23 seconds = 19.81 MB/sec

Maybe a firmware bug...
)

ydsmv

-bc

On Tue, 23 Jan 2001, Linda Walsh wrote:

> Date: Tue, 23 Jan 2001 20:17:01 -0800
> From: Linda Walsh <law@sgi.com>
> To: Andre Hedrick <andre@linux-ide.org>
> Cc: Florin Andrei <florin@sgi.com>, lkml <linux-kernel@vger.kernel.org>
> Subject: Re: 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:
>
> /dev/hda:
>
> 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
> law@sgi.com | Voice: (650) 933-5338
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> Please read the FAQ at http://www.tux.org/lkml/
>

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