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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Alexei Starovoitov <ast@plumgrid.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	netdev@vger.kernel.org, davem@davemloft.net, jhs@mojatatu.com
Subject: Re: [PATCH 2/2 net-next] net: move qdisc ingress filtering code where it belongs
Date: Mon, 11 May 2015 16:30:38 -0700	[thread overview]
Message-ID: <1431387038.566.47.camel@edumazet-glaptop2.roam.corp.google.com> (raw)
In-Reply-To: <555134F4.80007@plumgrid.com>

On Mon, 2015-05-11 at 16:02 -0700, Alexei Starovoitov wrote:
> On 5/11/15 7:35 AM, Eric Dumazet wrote:
> >
> > -static inline int deliver_skb(struct sk_buff *skb,
> > +static noinline int deliver_skb(struct sk_buff *skb,
> >   			      struct packet_type *pt_prev,
> >   			      struct net_device *orig_dev)
> 
> have tried the above only and didn't see any difference
> for simple 'netif_receive + drop in ip_rcv' test.
> Not sure whether it's actually worth doing. I would leave it as-is.

Yes, this was probably too aggressive.

unlikely() or static_key_false() are no moving code away enough, whole
function including unused code pollutes icache.

Code size increased a lot, while L1/L2 caches on cpu are about the same
than 6 years ago.

For example , commit 7866a621043fbaca3d7389e9b9f69dd1a2e5a855
helped a given workload, but probably made things slower for most common
cases.

  reply	other threads:[~2015-05-11 23:30 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-10 16:59 [PATCH 0/2 net-next] critical ingress path performance improvements Pablo Neira Ayuso
2015-05-10 16:59 ` [PATCH 1/2 net-next] net: kill useless net_*_ingress_queue() definitions when NET_CLS_ACT is unset Pablo Neira Ayuso
2015-05-10 16:58   ` Sergei Shtylyov
2015-05-10 16:59 ` [PATCH 2/2 net-next] net: move qdisc ingress filtering code where it belongs Pablo Neira Ayuso
2015-05-10 17:25   ` Eric Dumazet
2015-05-10 17:45   ` Alexei Starovoitov
2015-05-10 17:59     ` Pablo Neira Ayuso
2015-05-10 18:05       ` Alexei Starovoitov
2015-05-10 18:24         ` Pablo Neira Ayuso
2015-05-10 18:47           ` Alexei Starovoitov
2015-05-10 19:00             ` Pablo Neira Ayuso
2015-05-10 19:06               ` Alexei Starovoitov
2015-05-10 19:20                 ` Pablo Neira Ayuso
2015-05-10 19:37                   ` Alexei Starovoitov
2015-05-10 19:50                     ` Pablo Neira Ayuso
2015-05-10 21:31                       ` Daniel Borkmann
2015-05-10 21:44                         ` Daniel Borkmann
2015-05-10 23:43                           ` Pablo Neira Ayuso
2015-05-11  5:57                             ` Alexei Starovoitov
2015-05-11 12:49                               ` Jamal Hadi Salim
2015-05-11 12:58                               ` Daniel Borkmann
2015-05-11 17:15                                 ` Alexei Starovoitov
2015-05-11 13:32                               ` Pablo Neira Ayuso
2015-05-11 14:35                                 ` Eric Dumazet
2015-05-11 23:02                                   ` Alexei Starovoitov
2015-05-11 23:30                                     ` Eric Dumazet [this message]
2015-05-12  3:21                                       ` Alexei Starovoitov
2015-05-12 12:55                                       ` Pablo Neira Ayuso
2015-05-12 13:27                                         ` Daniel Borkmann
2015-05-12 21:22                                           ` Alexei Starovoitov
2015-05-12 21:43                                             ` Daniel Borkmann
2015-05-10 20:40             ` Daniel Borkmann

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