On Fri, May 16, 2025 at 05:56:59PM +0200, Juraj Marcin wrote: > From: Juraj Marcin <jmar...@redhat.com> > > With the default TCP stack configuration, it could be even 2 hours > before the connection times out due to the other side not being > reachable. However, in some cases, the application needs to be aware of > a connection issue much sooner. > > This is the case, for example, for postcopy live migration. If there is > no traffic from the migration destination guest (server-side) to the > migration source guest (client-side), the destination keeps waiting for > pages indefinitely and does not switch to the postcopy-paused state. > This can happen, for example, if the destination QEMU instance is > started with the '-S' command line option and the machine is not started > yet, or if the machine is idle and produces no new page faults for > not-yet-migrated pages. > > This patch introduces new inet socket parameters that control count, > idle period, and interval of TCP keep-alive packets before the > connection is considered broken. These parameters are available on > systems where the respective TCP socket options are defined, that > includes Linux, Windows, macOS, but not OpenBSD. Additionally, macOS > defines TCP_KEEPIDLE as TCP_KEEPALIVE instead, so the patch supplies its > own definition. > > The default value for all is 0, which means the system configuration is > used. > > Signed-off-by: Juraj Marcin <jmar...@redhat.com> > --- > meson.build | 30 ++++++++++++ > qapi/sockets.json | 19 ++++++++ > tests/unit/test-util-sockets.c | 33 ++++++++++++++ > util/qemu-sockets.c | 83 ++++++++++++++++++++++++++++++++++ > 4 files changed, 165 insertions(+)
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com> With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
