. To sharpen my point, yes, I know the P200 mobo doesn't support
UDMA. It supports PIO4, which is set up correctly in the BIOS (which, if
I remember correctly, the linux kernel really doesn't give a damn about
), and the kernel detects the mobo's PIO4 support as seen here:
PIIX3: IDE controller on PCI bus 00 dev 39
PIIX3: chipset revision 0
PIIX3: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xf4d0-0xf4d7, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xf4d8-0xf4df, BIOS settings: hdc:DMA, hdd:DMA
hda: ST33232A, ATA DISK drive
hdc: IBM-DTLA-305040, ATA DISK drive
hdd: ST330621A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 6303024 sectors (3227 MB) w/128KiB Cache, CHS=6253/16/63
hdc: 80418240 sectors (41174 MB) w/380KiB Cache, CHS=79780/16/63, (U)DMA
hdd: 58633344 sectors (30020 MB) w/512KiB Cache, CHS=58168/16/63, (U)DMA
but it should be writing at around 4 megs/sec, not 1Meg/sec.
Reiser limitation? cpu not handling it? where's the bottleneck?
>
> Hi!
>
> I'm getting this weird(?) behaviour from my system:
>
> 2 UDMA Harddisks, connected to a PIO4 motherboard (A Classic Pentium 200)
>
> They read at 5-8 Megs/sec, but they write at 1MB/sec.
> Is this normal?
>
> I'm using reiser 3.x on SuSE7.0/2.4.9 kernel
>
> 13:54|[pharoe] root:~#hdparm -Tt /dev/hdc /dev/hdd
>
> /dev/hdc:
> Timing buffer-cache reads: 128 MB in 5.47 seconds = 23.40 MB/sec
> Timing buffered disk reads: 64 MB in 7.57 seconds = 8.45 MB/sec
>
> /dev/hdd:
> Timing buffer-cache reads: 128 MB in 5.36 seconds = 23.88 MB/sec
> Timing buffered disk reads: 64 MB in 12.50 seconds = 5.12 MB/sec
> 13:55|[pharoe] root:~#hdparm /dev/hdc /dev/hdd
>
> /dev/hdc:
> multcount = 16 (on)
> I/O support = 1 (32-bit)
> unmaskirq = 0 (off)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 9972/128/63, sectors = 80418240, start = 0
>
> /dev/hdd:
> multcount = 16 (on)
> I/O support = 1 (32-bit)
> unmaskirq = 0 (off)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 3649/255/63, sectors = 58633344, start = 0
>
>
> ---= Miki Shapiro =------------------
> ---= Cell: (+972)-56-322433 =--------
> ---= ICQ: 3EE853 =-------------------
> ---= Windows Programmer in Rehab =---
> -------------------------------------
>
> "If at first you don't succeed...
> .. Skydiving is probbably not for you."
>
>
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