On Sat, 2006-06-24 at 07:59 +0200, Mike Galbraith wrote:
> On Thu, 2006-06-22 at 09:58 -0700, Danial Thom wrote:
>
> > And 75K pps may not be "much", but its still at
> > least 10% of what the system can handle, so it
> > should measure around a 10% load. 2.4 measures
> > about 12% load. So the only conclusion is that
> > load accounting is broken in 2.6.
>
> For UP, yes. SMP kernel accounts irq processing time properly.
For my little box, the below cures it.
--- linux-2.6.17x/arch/i386/kernel/apic.c.org 2006-06-24 08:08:46.000000000 +0200
+++ linux-2.6.17x/arch/i386/kernel/apic.c 2006-06-24 08:09:16.000000000 +0200
@@ -1175,9 +1175,7 @@ EXPORT_SYMBOL(switch_ipi_to_APIC_timer);
inline void smp_local_timer_interrupt(struct pt_regs * regs)
{
profile_tick(CPU_PROFILING, regs);
-#ifdef CONFIG_SMP
update_process_times(user_mode_vm(regs));
-#endif
/*
* We take the 'long' return path, and there every subsystem
-
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