Date: Sun, 13 Feb 2005 16:50:01 +1300 From: Mark Kirkwood <markir@paradise.net.nz> To: Rob <spamrefuse@yahoo.com> Cc: freebsd-stable@freebsd.org Subject: Re: atapci VIA 82C596B UDMA66 controller: problem for 5.X ? Message-ID: <420ECE69.9060006@paradise.net.nz> In-Reply-To: <20050212170129.28858.qmail@web54007.mail.yahoo.com> References: <20050212170129.28858.qmail@web54007.mail.yahoo.com>
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Rob wrote:
>
>
> What does that mean? UDMA66 and hw.ata.ata_dma=0 ?
>
Hmmm, that is interesting, 2 suggestion to determine what is going on:
- run diskinfo -t on your disks and let us know the results
- use sysctl to set hw.ata.ata_dma=1 and see what happens
> And why then is UDMA66 not automatically choosen
> at bootup?
At a guess I would suggest that dma is broken for your motherboards in
5.3 (what were they again?).
regards
Mark
P.s : My diskinfo results FYI:
zmori# diskinfo -t /dev/ad1s1a
/dev/ad1s1a
512 # sectorsize
18946621952 # mediasize in bytes (18G)
37005121 # mediasize in sectors
36711 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 5.024736 sec = 20.099 msec
Half stroke: 250 iter in 3.989959 sec = 15.960 msec
Quarter stroke: 500 iter in 6.864865 sec = 13.730 msec
Short forward: 400 iter in 3.010462 sec = 7.526 msec
Short backward: 400 iter in 1.247889 sec = 3.120 msec
Seq outer: 2048 iter in 0.490103 sec = 0.239 msec
Seq inner: 2048 iter in 0.457750 sec = 0.224 msec
Transfer rates:
outside: 102400 kbytes in 2.418307 sec = 42344
kbytes/sec
middle: 102400 kbytes in 2.571397 sec = 39823
kbytes/sec
inside: 102400 kbytes in 4.105673 sec = 24941
kbytes/sec
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