Date: Thu, 20 Sep 2001 09:00:50 -0700 (PDT) From: Tenebrae <tenebrae@niceboots.com> To: freebsd-stable@freebsd.org Subject: ad0: WRITE command timeout Message-ID: <Pine.BSF.4.21.0109200853250.81750-100000@steeltoe.niceboots.com>
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I found a couple messages in the freebsd-stable archives about this error,
but no real resolution...
I'm using freeBSD 4.3-STABLE (uname -a below).
FreeBSD steeltoe.niceboots.com 4.3-STABLE FreeBSD 4.3-STABLE #0: Thu May
17 22:58:45 PDT 2001 root@steeltoe.niceboots.com:/usr/src/sys/compile/GENERIC i386
I occasionally get a dmesg that says:
ad0: WRITE command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
I'm not sure what's causing it.
One of the messages in the archives said to do this and send the results:
sysctl -a hw.atamodes
Well, the results were huge, but this part appears to be the relevant
part:
hw.machine: i386
hw.model: AMD-K6(tm) 3D processor
hw.ncpu: 1
hw.byteorder: 1234
hw.physmem: 130170880
hw.usermem: 105263104
hw.pagesize: 4096
hw.floatingpoint: 1
hw.machine_arch: i386
hw.ata.ata_dma: 1
hw.ata.wc: 0
hw.ata.tags: 0
hw.ata.atapi_dma: 0
hw.atamodes: dma,---,pio,---,
hw.availpages: 31613
One guy said, "I had a similar problem with an old chipset which
did not support dma, so the controller (ata0) made a fallback to pio."
I'm afraid I'm a newbie tard and don't quite understand that and don't
know what FM to R.
I have an ASUS P5A motherboard that's supposed to support UDMA 33. From
ASUS's web site:
2 x PCI Bus Master IDE ports (Support up to 4 IDE devices) Support:
PIO Mode 3 & 4 : 17MB/Sec. DMD Mode 2: 17MB/Sec. (Max.; The Actual
Transfer Speed Depends On HD)
ATAPI IDE CD-ROM and LS-120 Supported
Ultra DMA/33 : 33MB/Sec.(Synchronous DMA Mode)
It has a 27GB IBM Deskstar HDD in it.
I believe these are the stats (don't have the model number handy, but I am
pretty sure it was a 7200RPM 27GB drive:
Rotational Speed- 7200 RPM
Interface - Ultra-ATA/66
Sustained data transfer rates - 22.9 to 13.8 MB/sec
Average seek time - 9.0 ms
Any ideas for me? I do so hate unresolved errors.
And while we're at it, dmesg.{yesterday,today} don't appear to clear out
and rotate the way I'd expect them to. I keep getting old partial dmesg
output e-mailed to me in my daily security output. Is this a FAQ as well?
Thanks.
-Tenebrae.
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