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Re: [Xen-devel] [PATCH v6 6/8] xen/arm: introduce GNTTABOP_cache_flush

To: "David Vrabel" <david.vrabel@xxxxxxxxxx>, "Stefano Stabellini" <stefano.stabellini@xxxxxxxxxxxxx>
From: "Jan Beulich" <JBeulich@xxxxxxxx>
Date: Fri, 17 Oct 2014 10:44:39 +0100
Cc: julien.grall@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian.Campbell@xxxxxxxxxx
Delivery-date: Fri, 17 Oct 2014 09:45:06 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

>>> On 16.10.14 at 19:29, <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> In any case the default max (32 frames) means 16000 iterations, that
> would take around 32000ns on a not very modern system. I don't think is
> that bad. And of course it is just the theoretical worst case.

2ns per iteration when there are 3 conditionals in the loop body
seems rather optimistic to me.

Jan


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References:
- [Xen-devel] [PATCH v6 0/8] xen/arm: introduce GNTTABOP_cache_flush
  - From: Stefano Stabellini
- [Xen-devel] [PATCH v6 6/8] xen/arm: introduce GNTTABOP_cache_flush
  - From: Stefano Stabellini
- Re: [Xen-devel] [PATCH v6 6/8] xen/arm: introduce GNTTABOP_cache_flush
  - From: David Vrabel
- Re: [Xen-devel] [PATCH v6 6/8] xen/arm: introduce GNTTABOP_cache_flush
  - From: Stefano Stabellini

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