linux-kernel - Re: [PATCH 0/2] powerpc/kvm: Enable running guests on RT Linux

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Date:	Thu, 9 Apr 2015 18:53:31 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Purcareata Bogdan <b43198@...escale.com>
CC:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Bogdan Purcareata <bogdan.purcareata@...escale.com>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-rt-users@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <mihai.caraman@...escale.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/2] powerpc/kvm: Enable running guests on RT Linux

On Thu, 2015-04-09 at 10:44 +0300, Purcareata Bogdan wrote:
> So at this point I was getting kinda frustrated so I decided to measure
> the time spend in kvm_mpic_write and kvm_mpic_read. I assumed these were
> the main entry points in the in-kernel MPIC and were basically executed
> while holding the spinlock. The scenario was the same - 24 VCPUs guest,
> with 24 virtio+vhost interfaces, only this time I ran 24 ping flood
> threads to another board instead of netperf. I assumed this would impose
> a heavier stress.
> 
> The latencies look pretty ok, around 1-2 us on average, with the max
> shown below:
> 
> .kvm_mpic_read	14.560
> .kvm_mpic_write	12.608
> 
> Those are also microseconds. This was run for about 15 mins.

What about other entry points such as kvm_set_msi() and
kvmppc_mpic_set_epr()?

-Scott


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