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2.4 kernel performance?

Has anyone noticed whether the 2.4 kernel on the Etrax 100LX has
significantly slower
performance than uClinux?

I've spent the best part of an afternoon observing that code compiled
running on uClinux
runs about 4 times faster than code on the 2.4.... however, it might be
e.g. the com port
drivers under 2.4... my software basically reads data from one com port and
writes it to another
and vice versa, but the throughput has dropped by more than 1/4 on Linux

Has anyone noticed anything similar?

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