netdev - Re: [PATCH net-next 1/4] net: allow large number of rx queues

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Message-ID: <CAHA+R7MnLy=8uL_hSnx=BN2QTs2kvempTxtmSO6hjcS+E0yRwg@mail.gmail.com>
Date:	Tue, 18 Nov 2014 12:29:15 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Pankaj Gupta <pagupta@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, dgibson@...hat.com,
	vfalico@...il.com, Eric Dumazet <edumazet@...gle.com>,
	Vladislav Yasevich <vyasevic@...hat.com>,
	Jerry Chu <hkchu@...gle.com>,
	wuzhy@...ux.vnet.ibm.com.pnq.redhat.com,
	Pavel Emelyanov <xemul@...allels.com>,
	Tom Herbert <therbert@...gle.com>, bhutchings@...arflare.com,
	xii@...gle.com, Stephen Hemminger <stephen@...workplumber.org>,
	Jiří Pírko <jiri@...nulli.us>,
	sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH net-next 1/4] net: allow large number of rx queues

On Tue, Nov 18, 2014 at 8:22 AM, Pankaj Gupta <pagupta@...hat.com> wrote:
>
> As vmalloc() adds overhead on a critical network path,
> __GFP_REPEAT flag is used with kzalloc() to do this fallback
> only when really needed.
>

Are you sure we need __GFP_REPEAT? We have vmalloc() as
fallback of kmalloc() in many places of networking (grep kvfree),
none of those I checked has this flag set.
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