netdev - Re: [PATCH net-next] udp/v6: prefetch rmem_alloc in udp6_queue_rcv

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Message-Id: <20170622.134420.722849803202881288.davem@davemloft.net>
Date:   Thu, 22 Jun 2017 13:44:20 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] udp/v6: prefetch rmem_alloc in
 udp6_queue_rcv_skb()

From: Paolo Abeni <pabeni@...hat.com>
Date: Thu, 22 Jun 2017 15:01:22 +0200

> very similar to commit dd99e425be23 ("udp: prefetch
> rmem_alloc in udp_queue_rcv_skb()"), this allows saving a cache
> miss when the BH is bottle-neck for UDP over ipv6 packet
> processing, e.g. for small packets when a single RX NIC ingress
> queue is in use.
> 
> Performances under flood when multiple NIC RX queues used are
> unaffected, but when a single NIC rx queue is in use, this
> gives ~8% performance improvement.
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Applied but please look into that DNS lookup regression which was
reported today.

Thank you.