linux-kernel - Re: [PATCH net-next v6 2/4] eventpoll: Add per-epoll busy poll packet budget

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Message-ID: <20240207110429.7fbf391e@kernel.org>
Date: Wed, 7 Feb 2024 11:04:29 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Joe Damato <jdamato@...tly.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 chuck.lever@...cle.com, jlayton@...nel.org, linux-api@...r.kernel.org,
 brauner@...nel.org, edumazet@...gle.com, davem@...emloft.net,
 alexander.duyck@...il.com, sridhar.samudrala@...el.com,
 willemdebruijn.kernel@...il.com, weiwan@...gle.com,
 David.Laight@...LAB.COM, arnd@...db.de, sdf@...gle.com,
 amritha.nambiar@...el.com, Alexander Viro <viro@...iv.linux.org.uk>, Jan
 Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org (open list:FILESYSTEMS
 (VFS and infrastructure))
Subject: Re: [PATCH net-next v6 2/4] eventpoll: Add per-epoll busy poll
 packet budget

On Mon,  5 Feb 2024 21:04:47 +0000 Joe Damato wrote:
> When using epoll-based busy poll, the packet budget is hardcoded to
> BUSY_POLL_BUDGET (8). Users may desire larger busy poll budgets, which
> can potentially increase throughput when busy polling under high network
> load.
> 
> Other busy poll methods allow setting the busy poll budget via
> SO_BUSY_POLL_BUDGET, but epoll-based busy polling uses a hardcoded
> value.
> 
> Fix this edge case by adding support for a per-epoll context busy poll
> packet budget. If not specified, the default value (BUSY_POLL_BUDGET) is
> used.

Reviewed-by: Jakub Kicinski <kuba@...nel.org>