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SubjectRe: Absolutely horrid IDE performance...
On Tue, 24 Nov 1998, Brian Macy wrote:

>On /dev/hda:
>hdparm gives 6.68meg/sec
>time dd if=/dev/hda of=/dev/null bs=4096 count=16384 gives well under
>1meg/sec (the more transfered the slower)

I have the same drive and under DMA mode2 (HX chipset PIIX3) I get:
Timing buffered disk reads: 64 MB in 6.67 seconds = 9.60 MB/sec
Timing buffered disk reads: 64 MB in 7.15 seconds = 8.95 MB/sec
Timing buffered disk reads: 64 MB in 6.64 seconds = 9.64 MB/sec

>/var/log/dmesg
>ide: i82371 PIIX (Triton) on PCI bus 0 function 57
> ide0: BM-DMA at 0xffa0-0xffa7
>hda: IBM-DTTA-371010, 9641MB w/465kB Cache, CHS=1024/255/63, UDMA

PIIX3: IDE controller on PCI bus 00 dev 39
PIIX3: not 100%% native mode: will probe irqs later
ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
hdc: IBM-DTTA-371010, 9641MB w/465kB Cache, CHS=19590/16/63, (U)DMA

Except I don't use LBA and I'm not in UDMA mode and this is 2.1.129.

> Model=BI-MTDAT3-1710 0 , FwRev=7TO77AB0, SerialNo=
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=34
> BuffType=3(DualPortCache), BuffSize=465kB, MaxMultSect=16, MultSect=off
> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=2(fast)
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=19746720
> tDMA={min:120,rec:120}, DMA modes: sword0 sword1 sword2 mword0 mword1
>mword2
> IORDY=on/off, tPIO={min:240,w/IORDY:120}, PIO modes: mode3 mode4

Same here. It also does UDMA 0-2 which your hdparm doesn't show.

>#time dd if=/dev/hda of=/dev/null bs=4096 count=16384
>0.01user 0.38system 2:13.61elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
>0inputs+0outputs (85major+11minor)pagefaults 0swaps
>#time dd if=/dev/sda of=/dev/null bs=4096 count=16384
>0.00user 0.20system 0:13.79elapsed 1%CPU (0avgtext+0avgdata 0maxresident)k
>0inputs+0outputs (81major+11minor)pagefaults 0swaps

I use: hdparm -m16 -c1 -d1 -u1 -X34 -W1 /dev/hd[ac]
(-m16 is redundant though)

0.05user 58.40system 1:15.72elapsed 77%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (84major+12minor)pagefaults 0swaps

Not sure about that, but a bonnie comparison against a 1GB Maxtor (hda):
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
IBM 100 846 95.0 10626 48.1 3535 37.9 6463 70.4 14288 54.4 1622.1 30.8
Maxtor 100 3871 41.8 3863 15.5 1543 12.9 4032 43.5 6188 20.9 798.0 14.6

-George


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