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SubjectRe: miserable performance of 2.6.21 under network load
> # opreport -l
> CPU: AMD64 processors, speed 1994.52 MHz (estimated)
> Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit mask of 0x00 (No unit mask) count 100000
> samples % app name symbol name
> 914379 48.8404 vmlinux-2.6.21.5 check_poison_obj
> 341920 18.2632 vmlinux-2.6.21.5 poison_obj

You have slab debugging enabled. That makes everything slow.
It costs you ~66% of your CPU time. Disable it.

-Andi

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