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    SubjectRe: aic7xxx bus speed
    >I've an aic7899: Ultra160 Wide scsi controller with a few disks
    >under an alpha ds20 running.
    >Now I'm having troubles getting 160MB/s bus speed on the
    >actual kernels (2.4.18pre2/2.5.2pre9). On the kernel 2.2.18 and
    >the redhat kernels 2.4.3-12, 2.4.9-13 I get full speed of 160MB/s.
    >But on the new kernel I get just 80MB/s per bus.

    You probably have IBM drives that say they are SCSI-2 yet can do
    160 speeds. There is a check in the driver that prevents it from
    negotiating from SCSI-2 drives so as to not blow up on SCSI-2 devices
    that don't support the new negotiation message type. I have a fix
    to work around IBM's mistake in the next driver release.

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