Date: Fri, 18 Jun 2004 20:45:44 +0200 From: Radek Kozlowski <radek@raadradd.com> To: current@freebsd.org Subject: Transfer mode of my ad0 no longer recognized correctly Message-ID: <40D33858.50300@raadradd.com>
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Hi,
when using a freshly built -CURRENT kernel (acpi enabled) the transfer
mode of my hard disk is set to PIO4 during system init (ad0: 38154MB
<IC25N040ATMR04-0> [77520/16/63] at ata0-master PIO4), whereas with a
kernel from 28th of May (acpi enabled) it is recognized corretly and set
to UDMA100 (ad0: 38154MB <IC25N040ATMR04-0> [77520/16/63] at ata0-master
UDMA100). My system's performance is very poor when the disk works in
PIO mode, so I'm using my older kernel for now.
My ata controller:
atapci0@pci0:16:0: class=0x0101b0 card=0x0024103c chip=0x522910b9
rev=0xc4 hdr=0x00
vendor = 'Acer Labs Incorporated (ALi)'
device = 'M1543 Southbridge EIDE Controller'
class = mass storage
subclass = ATA
I haven't changed anything in my kernel config file since this last
working kernel. Also, when I boot my recent kernel with acpi disabled,
the transfer rate is being correctly set to UDMA100.
When I boot with acpi enabled and try to change the transfer mode manually:
# atacontrol mode 0 udma100 xxx
Master = UDMA100
Slave = BIOSPIO
the transfer mode is changed, but I get a kernel panic (fatal trap 12)
immediately after that. I wanted to capture a core dump to later on use
it with gdb, but I'm unable to produce one. I did everything according
to developer's handbook but it's not working:
# grep dump /etc/rc.conf
dumpdev="/dev/ad0s1b"
dumpdir="/usr/crash"
# swapctl -l
Device: 1024-blocks Used:
/dev/ad0s1b 1048576 0
# sysctl kern | grep dump
kern.sugid_coredump: 0
kern.coredump: 1
One interesting thing is that there's no such oid as kern.dumpdev
(sysctl: unknown oid 'kern.dumpdev') and according to man sysctl there
should be one.
I'll probably take a photo of the output of the trace command in ddb
when I get home if I can't get a crash dump.
Should I provide more info about my system?
Thanks for any help.
-Radek
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