netdev - Re: Hight speed data sending from custom IP out of kernel

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Date:	Mon, 25 Apr 2011 14:48:21 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	juice@...gman.org, netdev@...r.kernel.org
Subject: Re: Hight speed data sending from custom IP out of kernel

Eric Dumazet wrote:
> Le lundi 25 avril 2011 à 14:27 +0200, Eric Dumazet a écrit :
>> Le lundi 25 avril 2011 à 14:18 +0200, Michal Simek a écrit :
>>
>>>> Now, if all you want to do is send many packets from pktgen (with only
>>>> ID changing), you could add a fast path to not rebuild from scratch new
>>>> packets.
>>> What do you mean?
>>
>> If you know your device has X slots in its TX ring buffer, you would
>> have to maintain at least X+1 skbs in pktgen to make sure you reuse an
>> skb while its previous logical content was sent on wire.
>>
>> Then you are free to only change iph->id and iph->check very fast.
>>

got it. There is an option to setup number of BDs in the driver where I need to 
use half skb because of nr_frags=2 where two BDs are used.

> 
> Checking skb->users would also be a good way to know if TX completion
> released skb reference. If your module owns the last reference, it can
> do a recycle.

Ok. I see that dev_kfree_skb(consume_skb).

Thanks will try,
Michal

-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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