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SubjectRe: [2.6] system is very slow during disk access
Michael Buesch <> wrote:
> But I've captured a few other interesting things in the syslog.
> After doing a
> $ hdparm -c1 -u1 -d1 -X69 /dev/hda
> I saw this in my syslog:
> Aug 7 00:32:05 lfs kernel: blk: queue c049195c, I/O limit 4095Mb (mask 0xffffffff)
> Aug 7 00:32:05 lfs kernel: hda: Speed warnings UDMA 3/4/5 is not functional.
> The onboard IDE controller is a UDMA-100 controller
> and the disks do run in this mode, too.


> 149 ide_outbsync 11,4615

it does seem that ide has gone bad. Perhaps you can run `hdaprm -X udma2'
or whatever the `-X' argument is to force it into UDMA2 mode.

But the driver should have done that for itself.
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