netdev - Re: [PATCH] skbuff: remove unused dma_head & dma

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Date:	Wed, 24 Mar 2010 07:48:06 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH] skbuff: remove unused dma_head & dma_maps fields

Le mardi 23 mars 2010 à 23:40 -0700, Jeff Kirsher a écrit :
> From: Alexander Duyck <alexander.h.duyck@...el.com>
> 
> The dma map fields in the skb_shared_info structure no longer has any users
> and can be dropped since it is making the skb_shared_info unecessarily larger.
> 
> Running slabtop show that we were using 4K slabs for the skb->head on x86_64 w/
> an allocation size of 1522.  It turns out that the dma_head and dma_maps array
> made skb_shared large enough that we had crossed over the 2k boundary with
> standard frames and as such we were using 4k blocks of memory for all skbs.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
> 

Thanks a lot for doing this cleanup !

Acked-by: Eric Dumazet <eric.dumazet@...il.com>



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