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Date: Fri, 4 Jun 2010 18:16:44 +0200
From: Michael Guntsche <mike@it-loops.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       netdev <netdev@vger.kernel.org>
Subject: Re: [2.6.35-rc1] page alloc failure order:1, mode:0x4020
Message-ID: <20100604161644.GA98048@trillian.local>
References: <20100604092025.GA96690@trillian.comsick.at>
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On 2010.06.04 14:53:34 , Eric Dumazet wrote:
> order-1 allocations are unfortunate, since this hardware should use
> order-0 ones if possible, and it seems it was its goal.
> 
> 3872 (0xF20) comes from 
<snip>
> 
> 1) Maybe rx_bufsize should not include the roundup() since 
> ath_rxbuf_alloc() also do an alignment adjustment ?
> 
> 2) We should try to reduce skb_shared_info by four bytes.
> 
> Could you try this patch ?
> 
> 
> We make sure rx_bufsize + various overhead <= PAGE_SIZE
> But I am not sure its legal for the hardware...

I applied the patch recompiled and run it on the routerboard, trying
to trigger the bug again.

Kind regards,
Michael