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

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Message-ID: <1498154351.2503.13.camel@redhat.com>
Date:   Thu, 22 Jun 2017 19:59:11 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] udp/v6: prefetch rmem_alloc in
 udp6_queue_rcv_skb()

On Thu, 2017-06-22 at 13:44 -0400, David Miller wrote:
> 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.

Sure! I'm on it right now.

Cheers,

Paolo