netdev - Re: [PATCH v2 net-next 2/2] tcp: reduce cpu usage when SO

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Message-ID: <1466621021.6850.71.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Wed, 22 Jun 2016 11:43:41 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jason Baron <jbaron@...mai.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 2/2] tcp: reduce cpu usage when SO_SNDBUF is
 set

On Wed, 2016-06-22 at 14:18 -0400, Jason Baron wrote:
> 

> 
> For 1/2, the getting the correct memory barrier, should I re-submit
> that as a separate patch?

Are you sure a full memory barrier (smp_mb() is needed ?

Maybe smp_wmb() would be enough ?

(And smp_rmb() in tcp_poll() ?)