Thanks all for your messages
Willy Tarreau wonders why I have hda1 in the letter and hdc1 in the
dmesg and suggests that the speed is related to the head movement.
Mike Dresser wonders what 'hdparm /dev/hda' and 'hdparm -Tt /dev/hda'
have to say and Marian Jancar wonders from
'ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:DMA'
that the kernel doesn't attemp UDMA anyway.
As for "hda1 and hdc3", I constantly change things around and
the dmesg that I sent in was made 2 days before the letter. In that time
hdc1 became hda1. I wouldn't be surprised to see that a transfer from one
drive to another did not make any speed increase. I have another drive
and will try it. Now as to what hdparm says, we have:
1) /dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 7297/255/63, sectors = 117231408, start = 0
and
2) /dev/hda:
Timing buffer-cache reads: 128 MB in 0.27 seconds =474.07 MB/sec
Timing buffered disk reads: 64 MB in 21.24 seconds = 3.01 MB/sec
In the second group we get a salesman's number, a realistic number
and in the first group there are some interesting entries indicating
that something may be wrong.
I/O support = 0 (default 16-bit)
using_dma = 0 (off)
Now as to why the kernel doesn't use UDMA anyway, I too am surprised
because I always believed that no matter what was in your machine the
kernel would always, under all circumstances give an optimal configuration.
Since the thought pleases me, I'll continue to believe it and attribute
this case to some obscure third stream phenomena.
Now a switch from 2.4.18 to 2.4.19 stops my USB mouse from working and also
gives a new dmesg that gives a clear indication of the IDE problem:
ICH3: IDE controller on PCI bus 00 dev f9
ICH3: detected chipset, but driver not compiled in!
So reconfiguring with:
Intel PIIXn chipsets support and
PIIXn Tuning support
gives us from dmesg
ide: Assuming 33MHz system bus speed for PIO modes;
ICH3: IDE controller on PCI bus 00 dev f9
PCI: Device 00:1f.1 not available because of resource collisions
ICH3: (ide_setup_pci_device:) Could not enable device.
also we have the following
K2.4.18: ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:DMA
K2.4.19: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
and
sh-2.05b# hdparm -d1 /dev/hda1
/dev/hda1:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Invalid argument
using_dma = 0 (off)
sh-2.05b# hdparm -c1 /dev/hda1
/dev/hda1:
setting 32-bit I/O support flag to 1
HDIO_SET_32BIT failed: Invalid argument
I/O support = 0 (default 16-bit)
hdparm -c1 /dev/hda1 worked before PIIXn support was
compiled in and would give
Timing buffered disk reads: 64 MB in 21.24 seconds = 5.51 MB/sec
Finally some pertinant information on the Machine
Processor: Dual 2.2Ghz Xeon P4
Chipset: Intel E7500
MCH: E7500
ICH3-S: 820801CA
P64H2: 82870P2
Regards Bruce
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This archive was generated by hypermail 2b29 : Thu Aug 15 2002 - 22:00:21 EST