netdev - Re: [PATCH net-next-2.6] net: Increase NET_SKB

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Date:	Fri, 07 May 2010 11:48:06 +0200
From:	Michal Simek <monstr@...str.eu>
To:	David Miller <davem@...emloft.net>
CC:	eric.dumazet@...il.com, netdev@...r.kernel.org, hadi@...erus.ca,
	therbert@...gle.com, microblaze-uclinux@...e.uq.edu.au
Subject: Re: [PATCH net-next-2.6] net: Increase NET_SKB_PAD to 64 bytes

David Miller wrote:
> From: Michal Simek <monstr@...str.eu>
> Date: Fri, 07 May 2010 09:53:48 +0200
> 
>> I will add this Microblaze patch to my repo for testing and anyway
>> should go through my repo.
> 
> It's already in the net-next-2.6 tree.

Anyway.

I am ok with removing NET_IP_ALIGN because it is already defined in 
skbuff.h to 2.
But increasing NET_SKB_PAD to 64 caused that Microblaze extends skb 
buffers for some bytes.
I measured it by iperf and netperf and I see regression around 1-2Mbit/s 
that's why I would like to ask you to revert this patch or keep at least 
NET_SKB_PAD part.

Thanks,
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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