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From: Jakub Kicinski <kuba@kernel.org>
To: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Cc: netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
	Arnd Bergmann <arnd@arndb.de>, Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>, Florian Westphal <fw@strlen.de>,
	linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-arch@vger.kernel.org,
	Andrei Vagin <avagin@gmail.com>
Subject: Re: [PATCH v2] sock: allow reading and changing sk_userlocks with setsockopt
Date: Fri, 30 Jul 2021 09:46:31 -0700	[thread overview]
Message-ID: <20210730094631.106b8bec@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <20210730160708.6544-1-ptikhomirov@virtuozzo.com>

On Fri, 30 Jul 2021 19:07:08 +0300 Pavel Tikhomirov wrote:
> SOCK_SNDBUF_LOCK and SOCK_RCVBUF_LOCK flags disable automatic socket
> buffers adjustment done by kernel (see tcp_fixup_rcvbuf() and
> tcp_sndbuf_expand()). If we've just created a new socket this adjustment
> is enabled on it, but if one changes the socket buffer size by
> setsockopt(SO_{SND,RCV}BUF*) it becomes disabled.
> 
> CRIU needs to call setsockopt(SO_{SND,RCV}BUF*) on each socket on
> restore as it first needs to increase buffer sizes for packet queues
> restore and second it needs to restore back original buffer sizes. So
> after CRIU restore all sockets become non-auto-adjustable, which can
> decrease network performance of restored applications significantly.
> 
> CRIU need to be able to restore sockets with enabled/disabled adjustment
> to the same state it was before dump, so let's add special setsockopt
> for it.
> 
> Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>

The patchwork bot is struggling to ingest this, please double check it
applies cleanly to net-next.

  reply	other threads:[~2021-07-30 16:46 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 16:07 Pavel Tikhomirov
2021-07-30 16:46 ` Jakub Kicinski [this message]
2021-08-02  8:26   ` Pavel Tikhomirov
2021-08-02 16:11     ` Jakub Kicinski
2021-08-03 11:04       ` Pavel Tikhomirov
2021-08-03 12:42         ` Jakub Kicinski

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