netdev - Re: [PATCH] net: Add back alignment for size for __alloc

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Message-ID: <4EB1D05B.6020605@gmail.com>
Date:	Thu, 03 Nov 2011 00:20:59 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tony Lindgren <tony@...mide.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] net: Add back alignment for size for __alloc_skb

On 03/11/2011 00:19, Tony Lindgren wrote:

> * David Miller <davem@...emloft.net> [111102 15:42]:
>> c> 
>>> The issue is calculation of skb->end, which is based upon calculated
>>> 'size' variable.
>>>
>>> skb->end determines alignment of skb_shared_info, which is where the
>>> alignment problem is occuring for Tony.
>>
>> Right, and SMP_CACHE_BYTES setting should save us in any case.
>>
>> For ARM, SMP_CACHE_BYTES seems to be set to L1_CACHE_BYTES which in
>> turn is set via ARM_L1_CACHE_SHIFT which can be set seemingly to any
>> value but the defaults are 5 and 6 which should be OK.
>>
>> So unless Tony is using a non-standard setting of ARM_L1_CACHE_SHIFT,
>> this report is a bit mysterious.
> 
> This is happening at least with omap1_defconfig. In that case we have
> ARM_L1_CACHE_SHIFT=5.
> 
> Regards,
> 
> Tony


Do you use SLOB, SLUB or SLAB ?

Thanks

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