netdev - Re: [PATCH v7] rps: Receive Packet Steering

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Date:	Fri, 12 Mar 2010 15:08:12 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH v7] rps: Receive Packet Steering

> One last point about placement of rxhash in struct sk_buff, that I
> missed in my previous review, sorry...
>
> You put it right before cb[48] which is now aligned to 8 bytes (since
> commit da3f5cf1 skbuff: align sk_buff::cb to 64 bit and close some
> potential holes), so this adds a 4 bytes hole.
>
> Please put it elsewhere, possibly close to fields that are read in
> get_rps_cpu() (skb->queue_mapping, skb->protocol, skb->data, ...) to
> minimize number of cache lines that dispatcher cpu has to bring into its
> cache, before giving skb to another cpu for IP/TCP processing.
>
Looks like it will fit right before queue_mapping, I'll put it there.

Tom
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