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SubjectRe: miserable performance of 2.6.21 under network load
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From: Aaron Porter <atporter@primate.net>
Date: Tue, 24 Jul 2007 11:49:09 -0700

> 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
> 37355 1.9953 nf_conntrack (no symbols)

You have SLAB debugging enabled, turn it off if you want
decent performance.
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