[Ok, once more with the correct subject :-] Hello, I have a question regarding the support condition of the aic79xx driver. I am running kernel version 2.6.14 (gentoo) on a dual processor system PCI-X system. I am using an Adaptec scsi adapter to run an HP Ultrium tape drive. Nothing else is attached to the controller. I was previously using an Adaptec 29160N (aic7892), which is a 32 bit, 66Mhz controller. With this controller, the tape was not able to maintain full streaming, or achieve full speed. Average rate was approximately 27MB per second. In order to address the performance problem, HP recommended that I change to a 64 bit U160 or U320 controller. I've put in an Adaptec 29320ALP-R (aic7901), which is a 32 bit, 133Mhz controller. With this controller, performance has dropped to an abysmal 2.7MB per second! I am running the controller at 133Mhz, but I have also tried locking it to 66Mhz with no effect. I am using the same cable with both controllers, and the terminator is built into the cable. Nothing stands out in /var/log/messages. So, can anyone offer ideas as to why the 79xx controller performs at one tenth the rate of the 78xx controller and how to fix it? Any help appreciated. Thanks, Denny - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
