Re: [PATCH v5 net-next 2/5] net: implement support for low latencysocket polling

[Eliezer Tamir]

On 28/05/2013 03:26, Eric Dumazet wrote:
> On Mon, 2013-05-27 at 10:44 +0300, Eliezer Tamir wrote:

> > diff --git a/include/net/sock.h b/include/net/sock.h
> > index 66772cf..c7c3ea6 100644
> > --- a/include/net/sock.h
> > +++ b/include/net/sock.h
> > @@ -281,6 +281,7 @@ struct cg_proto;
> >     *	@sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
> >     *	@sk_backlog_rcv: callback to process the backlog
> >     *	@sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
> > +  *	@sk_napi_id: id of the last napi context to receive data for sk
> >    */
> >   struct sock {
> >   	/*
> > @@ -399,6 +400,9 @@ struct sock {
> >   	int			(*sk_backlog_rcv)(struct sock *sk,
> >   						  struct sk_buff *skb);
> >   	void                    (*sk_destruct)(struct sock *sk);
> > +#ifdef CONFIG_NET_LL_RX_POLL
> > +	unsigned int		sk_napi_id;
> > +#endif
> >   };
>
> I believe this is a bad choice for data locality.
>
> I would rather move it in the same cache line than sk_rxhash

I will move it to right after sk_rxhash.

-Eliezer
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