From: Alexei Starovoitov <ast@plumgrid•com>
To: Eric Dumazet <eric.dumazet@gmail•com>
Cc: "David S. Miller" <davem@davemloft•net>,
Eric Dumazet <edumazet@google•com>,
Daniel Borkmann <daniel@iogearbox•net>,
Thomas Graf <tgraf@suug•ch>, Jamal Hadi Salim <jhs@mojatatu•com>,
John Fastabend <john.r.fastabend@intel•com>,
netdev@vger•kernel.org
Subject: Re: [PATCH RFC net-next] pktgen: introduce 'rx' mode
Date: Wed, 29 Apr 2015 16:28:05 -0700 [thread overview]
Message-ID: <55416905.7070308@plumgrid.com> (raw)
In-Reply-To: <1430348211.3711.66.camel@edumazet-glaptop2.roam.corp.google.com>
On 4/29/15 3:56 PM, Eric Dumazet wrote:
>
> So pktgen in RX mode MUST deliver skb with skb->users = 1, there is no
> way around it.
if I only knew how to do it...
The cost of continuously allocating skbs is way higher than
netif_receive_skb itself. Such benchmarking tool would measure the
speed of skb alloc/free instead of speed of netif_receive_skb.
Are you suggesting to pre-allocate 10s of millions of skbs and
then feed them in one go? The profile will be dominated by
cache misses in the first few lines of __netif_receive_skb_core()
where it accesses skb->dev,data,head. Doesn't sound too useful either.
Other thoughts?
next prev parent reply other threads:[~2015-04-29 23:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-29 2:11 [PATCH RFC net-next] netif_receive_skb performance Alexei Starovoitov
2015-04-29 2:11 ` [PATCH RFC net-next] pktgen: introduce 'rx' mode Alexei Starovoitov
2015-04-29 4:14 ` Eric Dumazet
2015-04-29 21:55 ` Alexei Starovoitov
2015-04-29 22:19 ` Eric Dumazet
2015-04-29 22:38 ` Alexei Starovoitov
2015-04-29 22:56 ` Eric Dumazet
2015-04-29 23:28 ` Alexei Starovoitov [this message]
2015-04-29 23:39 ` Eric Dumazet
2015-04-29 23:59 ` Alexei Starovoitov
2015-04-29 5:23 ` [PATCH RFC net-next] netif_receive_skb performance Eric Dumazet
2015-04-29 22:15 ` Alexei Starovoitov
2015-04-29 9:37 ` Daniel Borkmann
2015-04-29 22:20 ` Alexei Starovoitov
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