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Date:	Mon, 1 Feb 2016 14:12:36 +0100
From:	Hans Westgaard Ry <>
To:	Hannes Frederic Sowa <>,
	Eric Dumazet <>
Cc:	"David S. Miller" <>,
	Alexey Kuznetsov <>,
	James Morris <>,
	Hideaki YOSHIFUJI <>,
	Patrick McHardy <>,
	"open list:NETWORKING [GENERAL]" <>,
	open list <>,
	Haakon Bugge <>
Subject: Re: [PATCH v2] net:Add sysctl_tcp_sg_max_skb_frags

On 01/27/2016 07:12 PM, Hannes Frederic Sowa wrote:
> On 27.01.2016 16:15, Eric Dumazet wrote:
>> If it is a common one, it should be /proc/sys/net/core/... instead
>> of /proc/sys/net/ipv4/tcp_....
> >
>> Other providers include :
>> 1) GRO stack
>> 2) callers of sock_alloc_send_pskb(), alloc_skb_with_frags(),
>> sock_alloc_send_skb() ..
> I agree, this knob should get a generic name and live in a generic 
> net/ directory to control this globally, so things don't break during 
> forwarding etc.
> It does not solve the problem completely, e.g. when VMs send gso 
> packets through a vhost-net onto IPoIB, no?
> Thanks,
> Hannes
I have understood more of the problem Hannes raises and I realize that 
we need a slowpath in IPoIB to handle the problem
in question. I will make a new version of this patch with a more correct 
position/name of the sysctl-variable.
I'll also make a separate patch adding the slowpath i IPoIB.


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