From: Paolo Abeni <pabeni@redhat.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH net-next] udp/v6: prefetch rmem_alloc in udp6_queue_rcv_skb()
Date: Thu, 22 Jun 2017 19:59:11 +0200 [thread overview]
Message-ID: <1498154351.2503.13.camel@redhat.com> (raw)
In-Reply-To: <20170622.134420.722849803202881288.davem@davemloft.net>
On Thu, 2017-06-22 at 13:44 -0400, David Miller wrote:
> From: Paolo Abeni <pabeni@redhat.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@redhat.com>
>
> Applied but please look into that DNS lookup regression which was
> reported today.
Sure! I'm on it right now.
Cheers,
Paolo
next prev parent reply other threads:[~2017-06-22 17:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-22 13:01 [PATCH net-next] udp/v6: prefetch rmem_alloc in udp6_queue_rcv_skb() Paolo Abeni
2017-06-22 17:44 ` David Miller
2017-06-22 17:59 ` Paolo Abeni [this message]
2017-06-22 20:49 ` Jesper Dangaard Brouer
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