If a TCP socket will get live-migrated from one box to another the timestamps (which are typically ON) will get screwed up -- the new kernel will generate TS values that has nothing to do with what they were on dump. The solution is to yet again fix the kernel and put a "timestamp offset" on a socket.
A socket offset is added in places where externally visible tcp timestamp option is parsed/initialized. Connections in the SYN_RECV state are not supported, global tcp_time_stamp is used for them, because repair mode doesn't support this state. In a future it can be implemented by the similar way as for TIME_WAIT sockets. For time-wait sockets offset is inhereted by a proper tcp_sock. A per-socket offset can be set only for sockets in repair mode. Cc: "David S. Miller" <[email protected]> Cc: Alexey Kuznetsov <[email protected]> Cc: James Morris <[email protected]> Cc: Hideaki YOSHIFUJI <[email protected]> Cc: Patrick McHardy <[email protected]> Cc: Eric Dumazet <[email protected]> Cc: Pavel Emelyanov <[email protected]> Signed-off-by: Andrey Vagin <[email protected]> Andrey Vagin (3): tcp: adding a per-socket timestamp offset tcp: set and get per-socket timestamp tcp: send packets with a socket timestamp include/linux/tcp.h | 3 +++ include/uapi/linux/tcp.h | 1 + net/ipv4/tcp.c | 11 +++++++++++ net/ipv4/tcp_input.c | 8 +++++++- net/ipv4/tcp_ipv4.c | 12 +++++++----- net/ipv4/tcp_minisocks.c | 3 +++ net/ipv4/tcp_output.c | 4 ++-- net/ipv6/tcp_ipv6.c | 22 +++++++++++++--------- 8 files changed, 47 insertions(+), 17 deletions(-) -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
