From: Eliezer Tamir <eliezer.tamir@linux.intel.com>
To: Or Gerlitz <or.gerlitz@gmail.com>
Cc: Willem de Bruijn <willemb@google.com>,
e1000-devel@lists.sourceforge.net, netdev@vger.kernel.org,
HPA <hpa@zytor.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Alex Rosenbaum <alexr@mellanox.com>,
linux-kernel@vger.kernel.org,
Eliezer Tamir <eliezer@tamir.org.il>,
Andi Kleen <andi@firstfloor.org>,
Eric Dumazet <erdnetdev@gmail.com>,
Eilon Greenstien <eilong@broadcom.com>,
David Miller <davem@davemloft.net>
Subject: Re: [PATCH v6 net-next 2/5] net: implement support for low latency socket polling
Date: Wed, 29 May 2013 17:59:35 +0300 [thread overview]
Message-ID: <51A617D7.6000406@linux.intel.com> (raw)
In-Reply-To: <CAJZOPZJqF1FTLH3a3ZKUTA4ViesAZEkRi=dgd-ux8eRu9TyhBw@mail.gmail.com>
On 29/05/2013 17:14, Or Gerlitz wrote:
> On Wed, May 29, 2013 at 9:39 AM, Eliezer Tamir
> <eliezer.tamir@linux.intel.com> wrote:
>> Adds a new ndo_ll_poll method and the code that supports and uses it.
>> This method can be used by low latency applications to busy poll Ethernet
>> device queues directly from the socket code. The value of sysctl_net_ll_poll
>> controls how many microseconds to poll. Set to zero to disable.
>
> Unlike with TCP sockets, UDP sockets may receive packets from multiple
> sources and hence the receiving context may be steered to be executed
> on different cores through RSS or other Flow-Steering HW mechanisms
> which could mean different napi contexts for the same socket, is that
> a problem here? what's the severity?
Nothing will break if you poll on the wrong queue.
Your data will come through normal NAPI processing of the right queue.
One of the things we plan on adding in the next version is a more fine
grained control over which sockets get to busy poll.
-Eliezer
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next prev parent reply other threads:[~2013-05-29 14:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-29 6:39 [PATCH v6 net-next 0/5] net: low latency Ethernet device polling Eliezer Tamir
2013-05-29 6:39 ` [PATCH v6 net-next 1/5] net: add napi_id and hash Eliezer Tamir
2013-05-29 12:56 ` Eric Dumazet
2013-05-29 13:09 ` David Laight
2013-05-29 13:43 ` Eric Dumazet
2013-05-29 15:04 ` Eliezer Tamir
2013-05-29 20:09 ` Ben Hutchings
2013-05-30 6:51 ` Eliezer Tamir
2013-05-29 6:39 ` [PATCH v6 net-next 2/5] net: implement support for low latency socket polling Eliezer Tamir
2013-05-29 13:37 ` Eric Dumazet
2013-05-29 13:42 ` David Laight
2013-05-29 13:48 ` Eric Dumazet
2013-05-29 14:01 ` Eliezer Tamir
2013-05-29 14:20 ` yaniv saar
2013-05-29 15:01 ` Eliezer Tamir
2013-05-29 14:14 ` Or Gerlitz
2013-05-29 14:40 ` yaniv saar
2013-05-29 14:59 ` Eliezer Tamir [this message]
2013-05-29 18:52 ` Or Gerlitz
2013-05-29 19:08 ` Eric Dumazet
2013-05-30 5:58 ` Eliezer Tamir
2013-05-30 6:04 ` Eliezer Tamir
2013-05-29 20:20 ` Ben Hutchings
2013-05-29 6:39 ` [PATCH v6 net-next 3/5] tcp: add TCP support for low latency receive poll Eliezer Tamir
2013-05-29 13:38 ` Eric Dumazet
2013-05-29 6:39 ` [PATCH v6 net-next 4/5] ixgbe: Add support for ndo_ll_poll Eliezer Tamir
2013-05-29 6:40 ` [PATCH v6 net-next 5/5] ixgbe: add extra stats " Eliezer Tamir
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