netdev - Re: [PATCH] ipv6: Enable RFS sk_rxhash tracking for ipv6 sockets

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Message-ID: <1302115064.3209.132.camel@edumazet-laptop>
Date:	Wed, 06 Apr 2011 20:37:44 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	nhorman@...driver.com, netdev@...r.kernel.org,
	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, therbert@...gle.com
Subject: Re: [PATCH] ipv6: Enable RFS sk_rxhash tracking for ipv6 sockets

Le mercredi 06 avril 2011 à 11:27 -0700, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 06 Apr 2011 20:23:08 +0200
> 
> > Le mercredi 06 avril 2011 à 11:17 -0700, David Miller a écrit :
> >> From: Eric Dumazet <eric.dumazet@...il.com>
> >> Date: Wed, 06 Apr 2011 20:07:33 +0200
> >> 
> >> > This is why we used on ipv4 :
> >> > 
> >> > if (inet_sk(sk)->inet_daddr)
> >> > 	sock_rps_save_rxhash(sk, skb->rxhash);
> >> > 
> >> > 
> >> > Only arm RFS on UDP if socket is bound to a given remote peer.
> >> 
> >> Agreed, Neil please make this change to your ipv6 code.
> > 
> > BTW, do you guys know if NFS is using RFS right now (if TCP transport is
> > used) ?
> 
> It ought to be.  Are you specifically concerned that it might be
> missing the rxhash setting calls because of the APIs it uses to
> do socket I/O?
> 
> The SunRPC layer is a major user of tcp_read_sock(), for example.
> 
> But the packet processing will be done via the normal means,
> therefore we'll hit tcp_v4_do_rcv() and therefore save the
> rxhash.

Hmm, are multiple tcp sessions used between NFS client and server (One
per cpu on client ?)



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