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SubjectRe: [PATCH V2 net-next 1/1] hv_netvsc: Properly size the vrss queues
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From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: Wed, 27 May 2015 13:16:57 -0700

> The current algorithm for deciding on the number of VRSS channels is
> not optimal since we open up the min of number of CPUs online and the
> number of VRSS channels the host is offering. So on a 32 VCPU guest
> we could potentially open 32 VRSS subchannels. Experimentation has
> shown that it is best to limit the number of VRSS channels to the number
> of CPUs within a NUMA node.
>
> Here is the new algorithm for deciding on the number of sub-channels we
> would open up:
> 1) Pick the minimum of what the host is offering and what the driver
> in the guest is specifying as the default value.
> 2) Pick the minimum of (1) and the numbers of CPUs in the NUMA
> node the primary channel is bound to.
>
>
> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>

Applied, thanks.


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