netdev - Re: [RFC] tcp: use order-3 pages in tcp

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Date:	Sun, 23 Sep 2012 12:16:01 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jengelh@...i.de
Cc:	eric.dumazet@...il.com, rick.jones2@...com,
	subramanian.vijay@...il.com, netdev@...r.kernel.org
Subject: Re: [RFC] tcp: use order-3 pages in tcp_sendmsg()

From: Jan Engelhardt <jengelh@...i.de>
Date: Sun, 23 Sep 2012 14:47:28 +0200 (CEST)

> On Friday 2012-09-21 18:27, David Miller wrote:
> 
>>From: Eric Dumazet <eric.dumazet@...il.com>
>>Date: Fri, 21 Sep 2012 17:48:31 +0200
>>
>>> There is probably a reason why lo default MTU is 16436 ?
>>
>>That's what fit into L1 caches back in 1999
> 
> Would it make sense to automatically set lo's MTU on device
> registration to the actual size of the L1 that the $running system
> has?

I think a fixed value of 64K would be a easiest, because another issue
is that back in 1999 we didn't have GRO/GSO/etc.
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