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From: Cong Wang <>
To: Alexander Duyck <>
Cc: Eric Dumazet <>,,
	Linux Kernel Network Developers <>
Subject: Three questions about busy poll
Date: Thu, 14 Feb 2019 12:15:31 -0800	[thread overview]
Message-ID: <> (raw)


While looking into the busy polling in Linux kernel, three questions
come into my mind:

1. In the document[1], it claims depends on
either SO_BUSY_POLL or However, from the code in
ep_set_busy_poll_napi_id(), I don't see such a dependency. It simply
checks sysctl_net_busy_poll and sk->sk_napi_id, but sk->sk_napi_id is
always set as long as we enable CONFIG_NET_RX_BUSY_POLL. So what I am
missing here?

2. Why there is no socket option for Clearly
sysctl_net_busy_poll is global and SO_BUSY_POLL only works for

3. How is SO_INCOMING_NAPI_ID supposed to be used? I can't find any
useful documents online. Any example or more detailed doc?



             reply	other threads:[~2019-02-14 20:15 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-14 20:15 Cong Wang [this message]
2019-02-15  0:39 ` Willem de Bruijn
2019-02-15 19:04   ` Cong Wang
2019-02-15 22:46     ` Willem de Bruijn
2019-02-19  4:30       ` Cong Wang
2019-02-19 17:04         ` Willem de Bruijn
     [not found] ` <>
2019-02-15 19:18   ` Cong Wang
2019-02-22 20:00     ` Samudrala, Sridhar

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