linux-kernel - RE: [PATCH] locking/rwlocks: do not starve writers

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Message-ID: <5b0e13f57d77408aad59b0e8f232da36@AcuMS.aculab.com>
Date:   Fri, 17 Jun 2022 21:58:35 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Eric Dumazet' <edumazet@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Will Deacon <will@...nel.org>,
        "Roman Penyaev" <rpenyaev@...e.de>
Subject: RE: [PATCH] locking/rwlocks: do not starve writers

From: Eric Dumazet
> Sent: 17 June 2022 20:39
...
> I am converting RAW sockets to RCU.

I presume that is because you are shoving a lot of packets
through them?

Will that remove the horrid delayed free of the routing
table entry that gets created for IPv4 with 'hdrinc'
because the address in the packet might not match that
in the address buffer?

I've seen the softint code spend ages doing the final frees.

We have good reasons for using raw sockets to send a lot of UDP.
But 'hdrinc' has to be used to get the UDP checksum right.

	David

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