netdev - Re: ICMP packets - ll_temac with Microblaze

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Date:	Wed, 21 Dec 2011 11:45:08 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	monstr@...str.eu
Cc:	David Miller <davem@...emloft.net>,
	John Williams <john.williams@...alogix.com>,
	netdev@...r.kernel.org
Subject: Re: ICMP packets - ll_temac with Microblaze

Le mercredi 21 décembre 2011 à 11:41 +0100, Michal Simek a écrit :

> yes, page size is 4k.
> 
> Here is the log for allocation - origin size for MTU 9000 is 0x2420(9248) and size after
> overhead is 0x3f40(16192)
> 
> kmalloc_node_track_caller size 00002420, SKB_WITH_OVERHEAD(ksize(data)) 00003f40
> skb->head     c7870000
> skb->data     c7870000
> skb->tail     c7870000
> skb->truesize 000040c0
> skb->end      c7873f40
> 

So basically truesize is bigger than previous kernel, and you hit a
socket limit.  (RCVBUF ?)

truesize is more correct, so we uncover prior bugs.

We should allow at least one packet, regardless of its size :(



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