SMP and command tagged queing does not work! Maybe it's not supposed to and I missed it in the documentation. Redhat 6v0 (2.5.5 )and Adaptec 274x EISA with aic7xxx driver command queing enabled fail regardless of SCSI device when run SMP but work fine Non-SMP. 6v2 (2.5.14) does not work at all with distributed aic7xxx driver, but does work with driver from 6v0 with same results.
Thanks for the bug report. However, Red Hat no longer maintains this version of the product. Please upgrade to the latest version and open a new bug if the problem persists. The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, and if you believe this bug is interesting to them, please report the problem in the bug tracker at: http://bugzilla.fedora.us/