Greetings: This is Shane, I'm sorry to disturb you guys.
I have some questions which are about CPU usage percentage of "dd" process. I'm appreciated if you can give me some help or suggestion. When we do some test on our motherboards, we find that in some cases, the CPU usage percentage of "dd" is a little high when we dump data from SATA ODD DVD disc to SATA HDD: # dd if=/dev/cdwriter of=/root/temp.iso The CPU percentage of "dd" process sometimes is 30% to 50%, which is higher than we expect (<= 20%), and there is no other big program running at the same time. If the disc in SATA ODD is CD-R instead of DVD-R, the percentage is much smaller(<=20). So my questions are: (1) Is there an official normal range(or criteria) to the "dd" CPU percentage? (2) Can we say that it's abnormal if it is higher than 30% or even 50%? (3) And what kinds of factors lead to the high CPU percentage of "dd" and how to decrease it? BTW, my HW/SW Env: AMD SB700 + RS690 SAMSUNG SATA ODD Seagate SATA HDD RedHat RHEL5/RHEL4.6 and openSUSE10.3 Linux Thanks Best Regards Shane _______________________________________________ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
