linux-kernel - Re: [RFC] virtio: use mandatory barriers for remote processor vdevs

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Message-ID: <CAK=WgbZ5aBFNro3XC0cN+Ao4ZWrBHwwd3d__CSHA=n56gKmKXw@mail.gmail.com>
Date:	Wed, 30 Nov 2011 13:55:53 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC] virtio: use mandatory barriers for remote processor vdevs

On Tue, Nov 29, 2011 at 5:19 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> On Tue, Nov 29, 2011 at 03:57:19PM +0200, Ohad Ben-Cohen wrote:
>> > Is an extra branch faster or slower than reverting d57ed95?
>>
>> Sorry, unfortunately I have no way to measure this, as I don't have
>> any virtualization/x86 setup. I'm developing on ARM SoCs, where
>> virtualization hardware is coming, but not here yet.
>
> You can try using the micro-benchmark in tools/virtio/.

Hmm, care to show me exactly what do you mean ?

Though I somewhat suspect that any micro-benchmarking I'll do with my
random ARM SoC will not have much value to real virtualization/x86
workloads.

Thanks,
Ohad.
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