To: Sebastian Andrzej Siewior <email@example.com>
Cc: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org,
Subject: Re: [PATCH net-next] net/core: disable NET_RX_BUSY_POLL on PREEMPT_RT
Date: Fri, 01 Oct 2021 22:50:07 +0000 [thread overview]
Message-ID: <email@example.com> (raw)
This patch was applied to netdev/net-next.git (refs/heads/master):
On Fri, 1 Oct 2021 16:58:41 +0200 you wrote:
> napi_busy_loop() disables preemption and performs a NAPI poll. We can't acquire
> sleeping locks with disabled preemption which would be required while
> __napi_poll() invokes the callback of the driver.
> A threaded interrupt performing the NAPI-poll can be preempted on PREEMPT_RT.
> A RT thread on another CPU may observe NAPIF_STATE_SCHED bit set and busy-spin
> until it is cleared or its spin time runs out. Given it is the task with the
> highest priority it will never observe the NEED_RESCHED bit set.
> In this case the time is better spent by simply sleeping.
Here is the summary with links:
- [net-next] net/core: disable NET_RX_BUSY_POLL on PREEMPT_RT
You are awesome, thank you!
Deet-doot-dot, I am a bot.
prev parent reply other threads:[~2021-10-01 22:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 14:58 [PATCH net-next] net/core: disable NET_RX_BUSY_POLL on PREEMPT_RT Sebastian Andrzej Siewior
2021-10-01 22:50 ` patchwork-bot+netdevbpf [this message]
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