Date: Fri, 25 Jun 1999 23:09:41 -0400 From: Doug Ledford <dledford@redhat.com> To: Piete Brooks <Piete.Brooks@cl.cam.ac.uk> Cc: aic7xxx@FreeBSD.ORG Subject: Re: Help tuning an Adaptec 7896. Message-ID: <37744475.75963DFC@redhat.com> References: <E10xD2y-00005h-00@chatteris.cl.cam.ac.uk>
next in thread | previous in thread | raw e-mail | index | archive | help
Piete Brooks wrote: > > Exec Summary: How can I get more than 11MB from an Adaptec 7896 ? > > Gory Details: > > I have 9 GigaByte GA-6BXDU motherboards which have onboard "Adaptec 7896 Dual > Channel Ultra 2 SCSI", connected to a JBoD with 24 LVD 18GB disks, which > appear to only manage 11MB/s, > It looks as if the problem is that the period is set to 43 on the controller. > > Using the same discs and cables on a AIC-7881U and a Adaptec 2940U2, I get > 20MB/s and 80MB/s respectively (5 disc RAID0 manages over 60MB/s under hdparm) > so it does seem to point at the 7896. > > The Adaptec BIOS has all IDs set at 80MB/s > > Any ideas what is wrong ? > Any ideas how I can "over ride" the period of "43" ? This means that we are interpreting the flags in the BIOS differently than the BIOS does. Make sure you have tried the latest aic7xxx driver (5.1.17) and if it still does the same thing then forward me the output of the driver when the module is loaded with aic7xxx=dump_card or booting the linux kernel with the option aic7xxx=dump_card if you have the driver compiled into the kernel. The patch for 2.2 and 2.0 kernels can be found at http://www.redhat.com/~dledford/aic7xxx.html -- Doug Ledford <dledford@redhat.com> Opinions expressed are my own, but they should be everybody's. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?37744475.75963DFC>