Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1

[Thomas Charbonnel]

Ingo Molnar wrote :
> Florian Schmidt reported a minor bug that prevents a successful build if
> !CONFIG_LATENCY_TRACE - i've uploaded -R1 that fixes this:
>   
>  http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc1-bk4-R1
> 

I still get > 170 us latency from rtl8139 :
http://www.undata.org/~thomas/R1_rtl8139.trace

And again this one :
preemption latency trace v1.0.5 on 2.6.9-rc1-VP-R1
--------------------------------------------------
 latency: 597 us, entries: 12 (12)
    -----------------
    | task: swapper/0, uid:0 nice:0 policy:0 rt_prio:0
    -----------------
 => started at: smp_apic_timer_interrupt+0x32/0xd0
 => ended at:   smp_apic_timer_interrupt+0x86/0xd0
=======>
00010000 0.000ms (+0.000ms): smp_apic_timer_interrupt
(apic_timer_interrupt)
00010000 0.000ms (+0.000ms): profile_tick (smp_apic_timer_interrupt)
00010000 0.000ms (+0.000ms): profile_hook (profile_tick)
00010001 0.000ms (+0.595ms): notifier_call_chain (profile_hook)
00010000 0.595ms (+0.000ms): do_nmi (mcount)
00020000 0.596ms (+0.000ms): profile_tick (nmi_watchdog_tick)
00020000 0.596ms (+0.000ms): profile_hook (profile_tick)
00020001 0.597ms (+0.000ms): notifier_call_chain (profile_hook)
00020000 0.597ms (+689953.444ms): profile_hit (nmi_watchdog_tick)
00010001 689954.042ms (+1.141ms): update_process_times (do_timer)
00000001 0.597ms (+0.000ms): sub_preempt_count
(smp_apic_timer_interrupt)
00000001 0.598ms (+0.000ms): update_max_trace (check_preempt_timing)

Thomas


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