netdev - RE: [PATCH] net: use hardware buffer pool to allocate skb

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Message-ID: <43e8b86d47784ff78df70fc1b6e4b965@BLUPR03MB517.namprd03.prod.outlook.com>
Date:	Thu, 16 Oct 2014 02:30:05 +0000
From:	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"jkosina@...e.cz" <jkosina@...e.cz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"LeoLi@...escale.com" <LeoLi@...escale.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>
Subject: RE: [PATCH] net: use hardware buffer pool to allocate skb



> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@...workplumber.org]
> Sent: Wednesday, October 15, 2014 5:33 PM
> To: Pan Jiafei-B37022
> Cc: davem@...emloft.net; jkosina@...e.cz; netdev@...r.kernel.org; Li Yang-Leo-
> R58472; linux-doc@...r.kernel.org
> Subject: Re: [PATCH] net: use hardware buffer pool to allocate skb
> 
> Since an skb can sit forever in an application queue, you have created
> an easy way to livelock the system when enough skb's are waiting to be
> read.

I think there is no possible to livelock the system, because in my patch
The function __netdev_alloc_skb will try to allocate hardware block buffer
Firstly if dev->alloc_hw_skb is set, but it will continue allocate normal
skb buffer if the hardware block buffer allocation fails.
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