netdev - Re: [PATCH] net: Update netdev_alloc_frag to work more efficiently with TCP and GRO

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Date:	Thu, 21 Jun 2012 07:07:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev@...r.kernel.org, davem@...emloft.net,
	jeffrey.t.kirsher@...el.com
Subject: Re: [PATCH] net: Update netdev_alloc_frag to work more efficiently
 with TCP and GRO

On Wed, 2012-06-20 at 21:07 -0700, Alexander Duyck wrote:
> On 6/20/2012 6:21 AM, Eric Dumazet wrote:

> > +		nc->page = alloc_pages(GFP_ATOMIC | __GFP_COLD |
> > +				       (NETDEV_FRAG_ORDER ? __GFP_COMP : 0),
> > +				       NETDEV_FRAG_ORDER);

> I was wondering if you needed the check for NETDEV_FRAG_ORDER here.  
>  From what I can tell setting __GFP_COMP for an order 0 page has no 
> effect since it only seems to get checked in prep_new_page and that is 
> after a check to verify if the page is order 0 or not.

Good point, it seems some net drivers could be changed to remove
useless tests.

I'll post some performance data as well.



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