netdev - Re: [PATCH V2 net-next 1/1] hv_netvsc: Properly size the vrss queues

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Message-Id: <20150530.173900.1466293770301543958.davem@davemloft.net>
Date:	Sat, 30 May 2015 17:39:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kys@...rosoft.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Subject: Re: [PATCH V2 net-next 1/1] hv_netvsc: Properly size the vrss
 queues

From: "K. Y. Srinivasan" <kys@...rosoft.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@...rosoft.com>

Applied, thanks.
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