Messages in this thread | | | Subject | Re: aic7xxx bus speed | Date | Tue, 15 Jan 2002 08:50:04 -0700 | From | "Justin T. Gibbs" <> |
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>Hi >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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