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SubjectProblems even with 512 block size MOs

recent 2.4 kernels have incredible bad performance for me when handling MO
drives. Going back 2.2 shows better performance.

This is my setup:
SCSI subsystem driver Revision: 1.00
ncr53c8xx: at PCI bus 0, device 15, function 0
ncr53c8xx: 53c810 detected
ncr53c810-0: rev 0x2 on pci bus 0 device 15 function 0 irq 16
ncr53c810-0: ID 7, Fast-10, Parity Checking
scsi0 : ncr53c8xx-3.4.3-20010212
Vendor: FUJITSU Model: M2513A Rev: 1500
Type: Optical Device ANSI SCSI revision: 02
Vendor: PIONEER Model: DVD-ROM DVD-303 Rev: 1.10
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi removable disk sda at scsi0, channel 0, id 0, lun 0
ncr53c810-0-<0,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8)
SCSI device sda: 248826 512-byte hdwr sectors (127 MB)
sda: Write Protect is off
sda: unknown partition table

on a non-overclocked Dual celeron BP6 machine with 256MByte RAM

hertz:~> uname -a
Linux hertz 2.4.4-SMP #2 SMP Wed May 2 17:47:22 MEST 2001 i686 unknown
(recent kernel from

Copying a 6.5 MByte file with cp returns nearly immediately on the
commandline, but umount nearly takes forever. Maximum rate detected by
xosview during umount was about 30 kByte.

I have similar behaviour on another machine and with different disk. However
I don't get any "dmesg" output despite the "CONFIG_SCSI_LOGGING=y" option on
both machines.

Are all my MO disks rotten? Are the MO drives broken? Are my SCSI adapters
broken? Or is there a bug in the SCSI layer?


Uwe Bonnes

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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