Messages in this thread | | | Date | Fri, 6 Feb 2009 20:31:21 +0100 | From | Ingo Molnar <> | Subject | Re: PATCH: Allow over-ride of smp_found_cfg with kernel cmd-line option. |
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* Ben Greear <greearb@candelatech.com> wrote:
> Allow user to keep smp_found_cfg set to 1 even if MADT > cannot be parsed. This works around funky BIOS on FWA-7304 > (VIA CN700 chipset) system, and possibly other systems as well. > Without this override, performance drops by around 15% on > network throughput tests on this system.
The question is, _why_ does network performance drop?
Do you have a before/after pair of /proc/interrupts output perhaps? Does the layout of IRQs change?
The system is not SMP - so only something about UP-IOAPIC can be helpful to performance here - or some unknown effect.
Ingo
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