Rob wrote:
In this case there's only one harddisk and when I do
 # atacontrol mode 0 UDMA66 BIOSPIO

I get lots of such lines:

ad0: WARNING - WRITE_DMA UDMA ICRC error (retrying
 request) LBA=20185375
ad0: WARNING - WRITE_DMA UDMA ICRC error (retrying
 request) LBA=20185375
ad0: FAILURE - WRITE_DMA status=51<READY,DSC,ERROR>
 error=84<ICRC,ABORTED> LBA=20185375

I am wondering if building a kernel with the various debugging options turned on might help (see the developers handbook). If you can get a dump or trace then there is a good chance that one of the FreeBSD hackers on this list or -bugs can sort it!


Transfer rates:
        outside:       102400 kbytes in  19.370328 sec
=     5286 kbytes/sec
        middle:        102400 kbytes in  19.378847 sec
=     5284 kbytes/sec
        inside:        102400 kbytes in  19.379687 sec
=     5284 kbytes/sec

Pretty low transfer rates, clearly not UDMA66!

best wishes

Mark
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