On 06/01/2018 07:03 AM, Li RongQing wrote:
> RFC4821 say: The value for this timer MUST NOT be less than
> 5 minutes and is recommended to be 10 minutes, per RFC 1981.
>
> Signed-off-by: Li RongQing <lirongq...@baidu.com>
> ---
> net/ipv4/sysctl_net_ipv4.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
> index d2eed3ddcb0a..ed8952bb6874 100644
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -47,6 +47,7 @@ static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
> static int ip_ping_group_range_min[] = { 0, 0 };
> static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
> static int comp_sack_nr_max = 255;
> +static int tcp_probe_interval_min = 300;
>
> /* obsolete */
> static int sysctl_tcp_low_latency __read_mostly;
> @@ -711,7 +712,8 @@ static struct ctl_table ipv4_net_table[] = {
> .data = &init_net.ipv4.sysctl_tcp_probe_interval,
> .maxlen = sizeof(int),
> .mode = 0644,
> - .proc_handler = proc_dointvec,
> + .proc_handler = proc_dointvec_minmax,
> + .extra1 = &tcp_probe_interval_min,
> },
> {
> .procname = "igmp_link_local_mcast_reports",
>
Note that this change would stop people from being able to have packetdrill
tests which would run in a reasonable amount of time.
I do not believe linux kernel must enforce such a limit.
It is up to the admin to set a value here really, depending on the environment
the host is running in.
