netdev - Re: [PATCH v2] iwlwifi: fix skb truesize underestimation

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Date:	Sat, 24 Mar 2012 09:12:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Guy, Wey-Yi" <wey-yi.w.guy@...el.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Neal Cardwell <ncardwell@...gle.com>,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [PATCH v2] iwlwifi: fix skb truesize underestimation

Le samedi 24 mars 2012 à 08:35 -0700, Guy, Wey-Yi a écrit :
> Hi Eric,
> 
> On Fri, 2012-03-23 at 17:29 -0700, Eric Dumazet wrote:
> > By default, iwlwifi uses order-1 pages (8 KB) to store incoming frames,
> > but doesnt say so in skb->truesize.
> > 
> > This makes very possible to exhaust kernel memory since these skb evade
> > normal socket memory accounting.
> > 
> > As struct ieee80211_hdr is going to be pulled before calling IP stack,
> > there is no need to use dev_alloc_skb() to reserve NET_SKB_PAD bytes.
> > alloc_skb() is ok in this driver, allowing more tailroom.
> > 
> > Pull beginning of frame in skb header, in the hope we can reuse order-1
> > pages in the driver immediately for small frames and reduce their
> > truesize to the minimum (linear skbs)
> > 
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> > Cc: Wey-Yi Guy <wey-yi.w.guy@...el.com>
> > Cc: "John W. Linville" <linville@...driver.com>
> > Cc: Neal Cardwell <ncardwell@...gle.com>
> > ---
> 
> Is it ok I pull your patch into our internal tree first for regression
> testing, once the test is done, I will push your patch along with all
> our other patches together to wireless-next(John Linville).
> 
> By doing so, first, we know the patch is not breaking any functionality
> for all the devices(legacy/new), second, it is easier for us to sync-up
> with all the other changes we are making now.
> 

I am absolutely fine with this plan, thanks a lot !

BTW, why order-1 pages are the default on this driver ?


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