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From: David Laight <David.Laight@ACULAB.COM>
To: 'Eric Dumazet' <edumazet@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Waiman Long <longman@redhat.com>,
	Shakeel Butt <shakeelb@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Boqun Feng <boqun.feng@gmail.com>,
	Will Deacon <will@kernel.org>, "Roman Penyaev" <rpenyaev@suse.de>
Subject: RE: [PATCH] locking/rwlocks: do not starve writers
Date: Fri, 17 Jun 2022 21:58:35 +0000	[thread overview]
Message-ID: <5b0e13f57d77408aad59b0e8f232da36@AcuMS.aculab.com> (raw)
In-Reply-To: <CANn89iJXeUJRV2+8reUdaeARxYPPbCoG+9atmRFfy4kv0XX00A@mail.gmail.com>

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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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

  parent reply	other threads:[~2022-06-17 21:58 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-17  9:10 [PATCH] locking/rwlocks: do not starve writers Eric Dumazet
2022-06-17 12:07 ` Peter Zijlstra
2022-06-17 14:43   ` Waiman Long
2022-06-17 14:57     ` Shakeel Butt
2022-06-17 15:00       ` Waiman Long
2022-06-17 15:24         ` Eric Dumazet
2022-06-17 15:56           ` Peter Zijlstra
2022-06-17 17:41           ` Waiman Long
2022-06-17 17:45             ` Eric Dumazet
2022-06-17 18:57               ` Waiman Long
2022-06-18  8:43                 ` Hillf Danton
2022-06-17 19:04               ` Peter Zijlstra
2022-06-17 19:10                 ` Eric Dumazet
2022-06-17 19:19                   ` Linus Torvalds
2022-06-17 19:25                     ` Eric Dumazet
2022-06-17 19:34                       ` Linus Torvalds
2022-06-17 19:39                         ` Eric Dumazet
2022-06-17 19:48                           ` Linus Torvalds
2022-06-20  7:25                             ` Peter Zijlstra
2022-06-21 16:55                             ` Eric W. Biederman
2022-06-17 21:58                           ` David Laight [this message]
2022-06-17 19:34                     ` Shakeel Butt
2022-06-17 19:08               ` Linus Torvalds

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