2.0.27 axp : Sequential read from scsi CDROM device causes 95 % system load

Zarmfab Software Development (fabsoft@fabsoft2.zarm.uni-bremen.de)
Tue, 7 Jan 1997 17:05:58 +0100

Trying to copy a CD, i just noticed that reading big files from scsi CD decices
is nearly impossible at my DEC AS-400 running 2.0.27.

No matter how the read is done ( dd if=/dev/cdrom ... , cp /dev/cdrom >... ),
the reading process causes a system CPU load of 95%, the actual transfer rate
is about 100000 bytes / second.

Switching back to 2.0.20, the same commands work as they should.

Has anybody else seen this ?

-- 
Martin Cornelius, ZARMFAB software development, University of Bremen
phone: 49-421-218-4807    FAX: 49-421-218-3889
email: fabsoft@zarm.uni-bremen.de
paper-mail: Hochschulring / Am Fallturm, 28359 BREMEN, Germany