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Kernel 2.4.14 slow due to softirq daemon?




It seems that softirq daemon is eating to much CPU time on 2.4.14.
ps always shows it in running state and simple CPU bound benchmarks execute
much slower.

I noticed the problem when I measured Ethernet and memory throughput
performance with tcp_perf.c (it is included in
devboard_lx/tools/src/tcp_test). Here are the results of the memory fill
test on devboard:

2.4.5
=====
Large buffer fill          (1000 x 1000000 byte)  25 MB/sec
Small (cached) buffer fill (1000000 x 1000 byte) 176 MB/sec

2.4.14
=====
Large buffer fill          (1000 x 1000000 byte)  19 MB/sec
Small (cached) buffer fill (1000000 x 1000 byte) 114 MB/sec

Any ideas?

Regards
Zoran Tomicic