From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Song Liu <liu.song.a23@gmail.com>
Cc: Networking <netdev@vger.kernel.org>,
"Daniel Borkmann" <borkmann@iogearbox.net>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
bpf <bpf@vger.kernel.org>,
"Toke Høiland-Jørgensen" <toke@toke.dk>,
brouer@redhat.com
Subject: Re: [PATCH bpf-next 1/5] bpf: cpumap use ptr_ring_consume_batched
Date: Thu, 11 Apr 2019 13:23:39 +0200 [thread overview]
Message-ID: <20190411132339.5427313b@carbon> (raw)
In-Reply-To: <CAPhsuW5FQ_npvmCUSfDKUXFj_vXF4OVk34EKqHJXZtu5eYwF2Q@mail.gmail.com>
On Wed, 10 Apr 2019 16:24:37 -0700
Song Liu <liu.song.a23@gmail.com> wrote:
> > /* Feedback loop via tracepoint */
> > - trace_xdp_cpumap_kthread(rcpu->map_id, processed, drops, sched);
> > + trace_xdp_cpumap_kthread(rcpu->map_id, n, drops, sched);
>
> btw: can we do the tracepoint after local_bh_enable()?
I would rather not, as my experience is that this result in strange
inaccurate readings, because (as comment below says) this is a
CPU-process-reschedule point. The test tool reads these values and
calculate PPS.
> >
> > local_bh_enable(); /* resched point, may call do_softirq() */
> > }
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
next prev parent reply other threads:[~2019-04-11 11:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-10 11:43 [PATCH bpf-next 0/5] Bulk optimization for XDP cpumap redirect Jesper Dangaard Brouer
2019-04-10 11:43 ` [PATCH bpf-next 1/5] bpf: cpumap use ptr_ring_consume_batched Jesper Dangaard Brouer
2019-04-10 23:24 ` Song Liu
2019-04-11 11:23 ` Jesper Dangaard Brouer [this message]
2019-04-11 17:38 ` Song Liu
2019-04-10 11:43 ` [PATCH bpf-next 2/5] bpf: cpumap use netif_receive_skb_list Jesper Dangaard Brouer
2019-04-10 18:56 ` Edward Cree
2019-04-10 11:43 ` [PATCH bpf-next 3/5] net: core: introduce build_skb_around Jesper Dangaard Brouer
2019-04-10 23:34 ` Song Liu
2019-04-11 15:39 ` Jesper Dangaard Brouer
2019-04-11 17:43 ` Song Liu
2019-04-11 5:33 ` Ilias Apalodimas
2019-04-11 11:17 ` Jesper Dangaard Brouer
2019-04-10 11:43 ` [PATCH bpf-next 4/5] bpf: cpumap do bulk allocation of SKBs Jesper Dangaard Brouer
2019-04-10 23:30 ` Song Liu
2019-04-10 11:43 ` [PATCH bpf-next 5/5] bpf: cpumap memory prefetchw optimizations for struct page Jesper Dangaard Brouer
2019-04-10 23:35 ` Song Liu
2019-04-11 5:47 ` Ilias Apalodimas
2019-04-10 23:36 ` [PATCH bpf-next 0/5] Bulk optimization for XDP cpumap redirect Song Liu
2019-04-11 13:18 ` Jesper Dangaard Brouer
2019-04-11 17:45 ` Song Liu
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