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networkd: allow to configure default/initial send/recv congestion window and store persistentl (#7750)
Currently we can only change initcwnd/initrwnd in the following way, and it does not store persistently: sudo ip route change default via 192.168.1.1 dev tun0 initcwnd 20 sudo ip route change default via 192.168.1.1 dev tun0 initrwnd 20 For more details about initcwnd/initrwnd, please look at: http://hjzhao.blogspot.com/2012/05/increase-initcwnd-for-performance.html http://www.cdnplanet.com/blog/tune-tcp-initcwnd-for-optimum-performance or google 'initcwnd initrwnd' This work allows to configure the initcwnd and initrwnd. Closes #2118
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5543b2b2c9
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323d9329e7
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@ -1067,6 +1067,25 @@
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>InitialCongestionWindow=</varname></term>
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<listitem>
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<para>The TCP initial congestion window or <literal>InitialCongestionWindow</literal> is used during the start
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of a TCP connection. During the start of a TCP session, when a client requests for a resource, the server's initial congestion window
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determines how many data packets will be sent during the initial burst of data. Takes a number between between 1 and 4294967295 (2^32 - 1).
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Defaults to unset.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>InitialAdvertisedReceiveWindow=</varname></term>
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<listitem>
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<para>The TCP receive window size or <literal>InitialAdvertisedReceiveWindow</literal> is the amount of receive data (in bytes)
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that can be buffered at one time on a connection. The sending host can send only that amount of data before waiting for
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an acknowledgment and window update from the receiving host. Takes a number between 1 and 4294967295 (2^32 - 1). Defaults to unset.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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@ -553,6 +553,7 @@ static const NLType rtnl_route_metrics_types[] = {
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[RTAX_INITCWND] = { .type = NETLINK_TYPE_U32 },
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[RTAX_FEATURES] = { .type = NETLINK_TYPE_U32 },
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[RTAX_RTO_MIN] = { .type = NETLINK_TYPE_U32 },
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[RTAX_INITRWND] = { .type = NETLINK_TYPE_U32 },
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};
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static const NLTypeSystem rtnl_route_metrics_type_system = {
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@ -108,6 +108,8 @@ Route.GatewayOnlink, config_parse_gateway_onlink,
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Route.IPv6Preference, config_parse_ipv6_route_preference, 0, 0
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Route.Protocol, config_parse_route_protocol, 0, 0
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Route.Type, config_parse_route_type, 0, 0
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Route.InitialCongestionWindow, config_parse_tcp_window, 0, 0
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Route.InitialAdvertisedReceiveWindow, config_parse_tcp_window, 0, 0
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DHCP.ClientIdentifier, config_parse_dhcp_client_identifier, 0, offsetof(Network, dhcp_client_identifier)
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DHCP.UseDNS, config_parse_bool, 0, offsetof(Network, dhcp_use_dns)
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DHCP.UseNTP, config_parse_bool, 0, offsetof(Network, dhcp_use_ntp)
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@ -636,6 +636,18 @@ int route_configure(
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return log_error_errno(r, "Could not append RTAX_MTU attribute: %m");
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}
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if (route->initcwnd) {
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r = sd_netlink_message_append_u32(req, RTAX_INITCWND, route->initcwnd);
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if (r < 0)
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return log_error_errno(r, "Could not append RTAX_INITCWND attribute: %m");
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}
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if (route->initrwnd) {
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r = sd_netlink_message_append_u32(req, RTAX_INITRWND, route->initrwnd);
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if (r < 0)
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return log_error_errno(r, "Could not append RTAX_INITRWND attribute: %m");
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}
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r = sd_netlink_message_close_container(req);
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if (r < 0)
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return log_error_errno(r, "Could not append RTA_METRICS attribute: %m");
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@ -1069,3 +1081,49 @@ int config_parse_route_type(const char *unit,
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return 0;
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}
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int config_parse_tcp_window(const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_route_free_ Route *n = NULL;
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uint32_t k;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = route_new_static(network, filename, section_line, &n);
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if (r < 0)
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return r;
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r = safe_atou32(rvalue, &k);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Could not parse TCP %s \"%s\", ignoring assignment: %m", rvalue, lvalue);
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return 0;
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}
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if (streq(lvalue, "InitialCongestionWindow"))
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n->initcwnd = k;
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else if (streq(lvalue, "InitialAdvertisedReceiveWindow"))
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n->initrwnd = k;
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else {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse TCP %s: %s", lvalue, rvalue);
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return 0;
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}
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n = NULL;
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return 0;
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}
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@ -42,6 +42,8 @@ struct Route {
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uint32_t priority; /* note that ip(8) calls this 'metric' */
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uint32_t table;
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uint32_t mtu;
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uint32_t initcwnd;
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uint32_t initrwnd;
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unsigned char pref;
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unsigned flags;
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@ -82,3 +84,4 @@ int config_parse_gateway_onlink(const char *unit, const char *filename, unsigned
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int config_parse_ipv6_route_preference(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_route_protocol(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_route_type(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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int config_parse_tcp_window(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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