2.4.29: strange behaviour system clock

[Mario Vanoni]

the same with
2.4.29-rc[123]
2.4.28-lck1
2.4.23-aa3
every time repeatable

UP P4-3400HT, 2GB mem, no swap
IDE NEC DVD-RW ND-3500AG (dev/sr0)

DVD with 48 files (*.tar.bz2), 4.4GB

ntpdate -b swisstime.ethz.ch: offset 0.0...
time dircmp /mnt/cdrom /source
thinks it used 20 minutes, no errors
ntpdate -b ...: offset 1134 sec !!!

SMP dual P3-550, 1GB mem, no swap
SCSI PIONER DVD-ROM DVD-304 (slot-in, /dev/sr0)

same DVD, identical source (copied)

ntpdate -b ...: offset 0.0...
time dircmp /mnt/cdrom /source
thinks it used 12 minutes, no errors
ntpdate -b ...: 0.020522 sec

SMP dual Xeon-2800HT, 2GB mem, no swap
IDE NEC DVD-RW ND-2501A (/dev/sr0)

same deviation, offset tons of seconds
this is the production, time must remain correct

Burning CD/DVD with IDE burners,
there not exist SCSI burners,
similar retards of the system clock.
CD using cdrecord, DVD growisofs.

Doing hwclock --show, time is always correct.

Not in LKML, cc if you need, and ... thanks

Mario

PS We burn DVD only since 2 weeks,
  before only CD and only on the SCSI machine,
  and ... NO PROBLEM.

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