From: Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Alexander Duyck
<alexander.duyck-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
sridhar.samudrala-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [net-next PATCH v3 7/8] epoll: Add busy poll support to epoll with socket fds.
Date: Fri, 24 Mar 2017 20:33:38 -0700 [thread overview]
Message-ID: <1490412818.24891.9.camel@edumazet-glaptop3.roam.corp.google.com> (raw)
In-Reply-To: <20170324170830.15226.9932.stgit-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
On Fri, 2017-03-24 at 10:08 -0700, Alexander Duyck wrote:
> From: Sridhar Samudrala <sridhar.samudrala-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>
> This patch adds busy poll support to epoll. The implementation is meant to
> be opportunistic in that it will take the NAPI ID from the last socket
> that is added to the ready list that contains a valid NAPI ID and it will
> use that for busy polling until the ready list goes empty. Once the ready
> list goes empty the NAPI ID is reset and busy polling is disabled until a
> new socket is added to the ready list.
>
> In addition when we insert a new socket into the epoll we record the NAPI
> ID and assume we are going to receive events on it. If that doesn't occur
> it will be evicted as the active NAPI ID and we will resume normal
> behavior.
>
> An application can use SO_INCOMING_CPU or SO_REUSEPORT_ATTACH_C/EBPF socket
> options to spread the incoming connections to specific worker threads
> based on the incoming queue. This enables epoll for each worker thread
> to have only sockets that receive packets from a single queue. So when an
> application calls epoll_wait() and there are no events available to report,
> busy polling is done on the associated queue to pull the packets.
>
> Signed-off-by: Sridhar Samudrala <sridhar.samudrala-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Alexander Duyck <alexander.h.duyck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
> fs/eventpoll.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 93 insertions(+)
Acked-by: Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
next prev parent reply other threads:[~2017-03-25 3:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-24 17:07 [net-next PATCH v3 0/8] Add busy poll support for epoll Alexander Duyck
2017-03-24 17:08 ` [net-next PATCH v3 2/8] tcp: Record Rx hash and NAPI ID in tcp_child_process Alexander Duyck
2017-03-24 17:08 ` [net-next PATCH v3 3/8] net: Only define skb_mark_napi_id in one spot instead of two Alexander Duyck
[not found] ` <20170324164902.15226.48358.stgit-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2017-03-24 17:07 ` [net-next PATCH v3 1/8] net: Busy polling should ignore sender CPUs Alexander Duyck
2017-03-24 17:08 ` [net-next PATCH v3 4/8] net: Change return type of sk_busy_loop from bool to void Alexander Duyck
2019-03-20 18:35 ` Christoph Paasch
2019-03-20 19:40 ` David Miller
2019-03-21 9:45 ` Paolo Abeni
2019-03-21 14:28 ` Willem de Bruijn
2019-03-21 16:43 ` Alexander Duyck
2019-03-22 3:05 ` Christoph Paasch
2019-03-22 10:33 ` Paolo Abeni
2019-03-22 12:59 ` Eric Dumazet
2019-03-22 13:35 ` Paolo Abeni
2019-03-22 19:25 ` Christoph Paasch
2017-03-24 17:08 ` [net-next PATCH v3 5/8] net: Track start of busy loop instead of when it should end Alexander Duyck
[not found] ` <20170324170818.15226.51326.stgit-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2017-03-25 3:34 ` Eric Dumazet
2017-03-25 2:23 ` [net-next PATCH v3 0/8] Add busy poll support for epoll David Miller
2017-03-25 3:49 ` David Miller
2017-03-24 17:08 ` [net-next PATCH v3 6/8] net: Commonize busy polling code to focus on napi_id instead of socket Alexander Duyck
2017-03-24 17:08 ` [net-next PATCH v3 7/8] epoll: Add busy poll support to epoll with socket fds Alexander Duyck
[not found] ` <20170324170830.15226.9932.stgit-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2017-03-25 3:33 ` Eric Dumazet [this message]
2017-03-24 17:08 ` [net-next PATCH v3 8/8] net: Introduce SO_INCOMING_NAPI_ID Alexander Duyck
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