netdev - Re: [PATCH net-next 0/3] Add support to do threaded napi busy poll

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Message-ID: <Z3cFbdjD4OtSwB44@mini-arch>
Date: Thu, 2 Jan 2025 13:30:21 -0800
From: Stanislav Fomichev <stfomichev@...il.com>
To: Samiullah Khawaja <skhawaja@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
	"David S . Miller " <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, jdamato@...tly.com
Subject: Re: [PATCH net-next 0/3] Add support to do threaded napi busy poll

On 01/02, Samiullah Khawaja wrote:
> Extend the already existing support of threaded napi poll to do continuous
> busypolling.
> 
> This is used for doing continuous polling of napi to fetch descriptors from
> backing RX/TX queues for low latency applications. Allow enabling of threaded
> busypoll using netlink so this can be enabled on a set of dedicated napis for
> low latency applications.
> 
> Currently threaded napi is only enabled at device level using sysfs. Add
> support to enable/disable threaded mode for a napi individually. This can be
> done using the netlink interface. Add `set_threaded` op in netlink spec that
> allows setting the `threaded` attribute of a napi.
> 
> Extend the threaded attribute in napi struct to add an option to enable
> continuous busy polling. Extend the netlink and sysfs interface to allow
> enabled/disabling threaded busypolling at device or individual napi level.
> 
> Once threaded busypoll on a napi is enabled, depending on the application
> requirements the polling thread can be moved to dedicated cores. We used this
> for AF_XDP usecases to fetch packets from RX queues to reduce latency.

Joe recently added tools/testing/selftests/net/busy_poller.c, should we
extend it to cover your new threaded/non-thread busy/non-busy napi modes?