netdev - Re: ICMP packets - ll_temac with Microblaze

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Date:	Wed, 21 Dec 2011 12:05:55 +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 11:54 +0100, Michal Simek a écrit :
> Eric Dumazet wrote:
> > 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 ?)
> 
> Where is that limit setup?
> 

Might be in the application itself.

setsockopt(socket, SOL_SOCKET, SO_RCVBUF, &limit, sizeof(limit));

kernel currently apply a factor of two to take into account skb
overhead. This might be not enough with jumbo frames.



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