netdev - Re: RFC: MTU for serving NFS on Infiniband

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Message-ID: <1282823827.2476.663.camel@edumazet-laptop>
Date:	Thu, 26 Aug 2010 13:57:07 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Marc Aurele La France <tsi@...berta.ca>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: RFC: MTU for serving NFS on Infiniband

Le jeudi 26 août 2010 à 05:40 -0600, Marc Aurele La France a écrit :

> Steady now.  There's no need to YELL nor be arrogant.  You and I both know 
> there's a place for NFS over UDP.  That's not changing any time soon.  While 
> I'm aware of the issue you brought up, it is separate from the one at hand in 
> this discussion.
> 
> I do want to thank you, however, for reminding me of TCP.  It's something 
> 20/20 hindsight says I should have checked out before starting this thread. 
> Logistically, it'll be a few days before I can do so though.  If that allows 
> me to increase the MTU all the way up to 65520, then this UDP thing will 
> likely remain unresolved.
> 

Unfortunately, your infiniband device lacks NETIF_F_SG support.

MTU a bit larger than PAGE_SIZE-overhead will need high order
allocations ?



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