Re: [lkp] [x86/MSI] 52f518a3a7c: -30.5% netperf.Throughput_tps

From: Thomas Gleixner
Date: Tue Jun 16 2015 - 02:13:57 EST

On Tue, 16 Jun 2015, Jiang Liu wrote:

> On 2015/6/16 1:52, Thomas Gleixner wrote:
> > On Mon, 15 Jun 2015, Huang Ying wrote:
> >
> >> FYI, we noticed the below changes on
> >>
> >> git:// master
> >> commit 52f518a3a7c2f80551a38d38be28bc9f335e713c ("x86/MSI: Use hierarchical irqdomains to manage MSI interrupts")
> >>
> >
> > I really appreciate this testing effort, but the information provided
> > is not really helpful.
> >
> > I asked this before. Can you pretty please, upload ALL relevant
> > information (.config, full dmesg, below stats, /proc/interrupts ...)
> > to some place where everyone interested can download them?
> >
> > Then themail contains a useful link instead of 200k waste of network bandwidth.
> Hi Ying and Thomas,
> I guess this report discloses a regression in hierarchy
> irqdomain, and which should have been fixed by the patch posted at:
> The root cause is that, with hierarchy irqdomain enabled,
> there are multiple irq_data associated with one irq. And function
> irq_move_irq() on x86 uses a wrong copy of irq_data to check
> whether there's pending irq migration operation. So all irq migration
> /set_affinity operations will get pending for ever. This may
> affect network performance due to interrupt load balance issue.
> And the patch set posted at
> should have solved all such regressions.

Next time, please send fixes which need to be applied right away
seperate from patch series which touch the world and some more.


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