lkml.org 
[lkml]   [2021]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] sock: allow reading and changing sk_userlocks with setsockopt
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.

\
 
 \ /
  Last update: 2021-07-30 18:47    [W:0.200 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site