tim@cit-vax.Caltech.Edu (Timothy L. Kay) (07/07/90)
I have seen quite a discussion about performance tuning the Adaptec controller. I have a Future Domain 881, and I am curious just how fast I should expect it to be. I did dd if=/unix of=/dev/null bs=32k and clocked about 170 KB/s. I did a dd if=/dev/rdsk/0p0 of=/dev/null bs=32k count=100 and clocked about 360 KB/s. First of all, are these all I can expect? I understand that the 881 is a slower controller, and I have only a 386/20 anyway. Secondly, why do I get timings like 0.1u 9.1s 0:07 130% in which I get more than 100% of the machine? Is it that the accounting is messed up because interrupts are being turned off for a non-trivial amount of time or something like that? Tim