2.4.x & PPP-or-IP-or-TCP

hello again,
cant tolerate more this feature: just cant get
this brand new preemption patch, just because ppp_interface_error_count absolutely_selectively_data_dependant increases!

for interested and wanting to help:
http://tech9.net/rml/linux/patch-rml-2.4.8-ac12-preempt-kernel-1
just cant get. no way. period.

not closely related details:
on my old 5x86 that was quite a curse: 2.2 - ok, 2.4 - silent death, 85% of packets died on this ppp interface (that was another issue, and mostly wasnt data dependant(i.e. data dependant was 3% of all errors)), and also packets which had an unfortunateness to be received at one time with disk access also were 99% dead.

here and now:
doesnt depend on packet compression: deflate/bsd/vj - etc doesnt depend on v42 modem compression.
tried 2 differrent modems(sportster 14400 voice/ Zyxel omni 56k). ppp 2.4.0.

sounds for me like a ppp crc issue.

cheers,
Sam