linux-kernel - Re: [PATCH] af_packet: Don't use skb after dev_queue

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Message-ID: <20100118220814.GG3157@del.dom.local>
Date:	Mon, 18 Jan 2010 23:08:14 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Michael Breuer <mbreuer@...jas.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	flyboy@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] af_packet: Don't use skb after dev_queue_xmit()

On Mon, Jan 18, 2010 at 04:39:24PM -0500, Michael Breuer wrote:
> Some output from tc -s qdisc:
...
> After the conclusion of the test:
> qdisc pfifo_fast 0: dev eth0 root refcnt 2 bands 3 priomap  1 2 2 2
> 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 244900497 bytes 3416350 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: dev eth1 root refcnt 2 bands 3 priomap  1 2 2 2
> 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 564380 bytes 4708 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0

Great!

> 
> 
> During the test, 8.9GB received; 232.9MB sent).
> 
> I also connected a second device through the wifi router. I was able
> to ping that device w/o loss while DHCP packets were being dropped
> to the other connected device.

Could you remind us if the problem is always with this first device?
Btw, I wonder if you could test it skipping the (HP?) switch?

Jarek P.
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