Hi, jludwig,
More than 95% hard drives are from Maxtor, they support UDMA5 (burst
speed at 100MB/s), or some even UDMA6 (133MB/s). The main PCI chipset is
Intel 82801BA, which can support PCI at 33MB/s, with "133MB/s Maximum
throughput".
Formerly I specify "idebux=66" parameter to kernel when system boot,
but it doesn't help. The sustainable PCI speed is still about 33MB/s.
So, I don't think "idebux=133" is quite helpful under this situation.
There should be some limitation somewhere, for my case, maybe the Intel
Chipset 82801BA is the bottleneck?
Thanks.
--Guolin Cheng
-----Original Message-----
From: jludwig [mailto:wralphie@comcast.net]
Sent: Friday, April 30, 2004 3:14 PM
To: For users of Fedora Core releases
Subject: Re: disk problems or false alarm??
On Fri, 2004-04-30 at 17:14, Alexander Dalloz wrote:
Am Fr, den 30.04.2004 schrieb Guolin Cheng um 22:54:
> My only concern is, I have been using "hdparm -d1 -c3 -m16 -a16 -A1
-u1
-W1 -k1 -K1
> " command on all 4 PATA hard drives, to speed up disk
access speed,
and improve
> machines' responsiveness. All other options seems OK except
"-u1",
which, according
> to manual, may bring "massive filesystem corruption"
(Although for 3
years I have seen
> no file system corruptions because of that). But if I don't
enable
the options, the Linux
> boxes will response way slow to keyboard when high-speed data
transfer happens.
> Guolin Cheng
Well, forcing such agressive settings like you did is often cause for
trouble. I don't wonder any more. You did not mention such
non-selfdetected settings in your first mail. Communication between
the
hard drive and the motherboard hardware using the chipset specific
driver is critical. In most every case you should let the kernel
autodetect the drives settings and not force things.
Alexander
I might add that I see nothing about bus speed. The default for linux
has been 33Mhz for IDE systems (adding idebus=133 quadruples drive
speed).
I don't know about your system's maximum bus speed or your drives.
--
jludwig <wralphie(a)comcast.net>
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