netdev - Re: [Xen-devel] [PATCH V3 0/2] limit xen vnic max queues number to online cpus number

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Date:	Fri, 23 Oct 2015 10:50:13 +0100
From:	Andrew Cooper <andrew.cooper3@...rix.com>
To:	Joe Jin <joe.jin@...cle.com>, <wei.liu2@...rix.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jan Beulich <JBeulich@...e.com>
CC:	<netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org>
Subject: Re: [Xen-devel] [PATCH V3 0/2] limit xen vnic max queues number to
 online cpus number

On 23/10/15 10:42, Joe Jin wrote:
> Currently xen vnic allowed to create lots of queues by set module param
> max_queues(both netback and netfront), when queues number larger than
> cpus number, it does not help for performance but need more cpu time.
>
> This patchset limit netback and netfront max queues number to online
> cpus number.
>
> Joe Jin (2):
>   xen-netback: limit xen vif max queues number to online cpus
>   xen-netfront: limit vnic max_queues number to online cpus

Please do not exclude the possibility for making crazy numbers of queues.

I can appreciate the want to prevent people shooting themselves in the
foot, but being able oversubscribe the number of queues is important for
performance testing.

~Andrew
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