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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Joe Jin <joe.jin@oracle.com>, <wei.liu2@citrix.com>,
	Ian Campbell <ian.campbell@citrix.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jan Beulich <JBeulich@suse.com>
Cc: <netdev@vger.kernel.org>, <xen-devel@lists.xenproject.org>
Subject: Re: [Xen-devel] [PATCH V3 0/2] limit xen vnic max queues number to online cpus number
Date: Fri, 23 Oct 2015 10:50:13 +0100	[thread overview]
Message-ID: <562A02D5.9000505@citrix.com> (raw)
In-Reply-To: <562A0108.3070501@oracle.com>

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

  parent reply	other threads:[~2015-10-23  9:50 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-23  9:42 [PATCH V3 0/2] limit xen vnic max queues number to online cpus number Joe Jin
2015-10-23  9:44 ` [PATCH V3 1/2] xen-netback: limit xen vif max queues number to online cpus Joe Jin
2015-10-23  9:44 ` Joe Jin
2015-10-23  9:51   ` [Xen-devel] " Andrew Cooper
2015-10-23  9:51   ` Andrew Cooper
2015-10-26 14:54   ` Wei Liu
2015-10-26 14:54   ` Wei Liu
2015-10-23  9:45 ` [PATCH V3 2/2] xen-netfront: limit vnic max_queues " Joe Jin
2015-10-23  9:45 ` Joe Jin
2015-10-23  9:50 ` Andrew Cooper [this message]
2015-10-23  9:50 ` [PATCH V3 0/2] limit xen vnic max queues number to online cpus number Andrew Cooper

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