Messages in this thread | | | Date | Tue, 24 Jul 2007 21:13:47 +0200 | From | Andi Kleen <> | Subject | Re: miserable performance of 2.6.21 under network load |
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> # 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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