netdev - Re: [PATCH v6 net-next 2/5] net: implement support for low latency socket polling

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Message-ID: <CALuTh9EcKCgx3pktq7FXkojhDxKn580csJV-u3BBokhhY2SrSg@mail.gmail.com>
Date:	Wed, 29 May 2013 17:40:02 +0300
From:	yaniv saar <yaniv.mellanox@...il.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v6 net-next 2/5] net: implement support for low latency
 socket polling

Hi Eliezer,

(If I'm too late then a future note...)
Why make polling a system-wide configuration?
Wouldn't it make more sense to implement a sock option?
An even better solution might be aggregation/combination of both types
of configurations.

-- Yaniv Sa'ar


On Wed, May 29, 2013 at 5:14 PM, Or Gerlitz <or.gerlitz@...il.com> wrote:
> On Wed, May 29, 2013 at 9:39 AM, Eliezer Tamir
> <eliezer.tamir@...ux.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?
>
> Or.
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