Merge "Evaluate data stall via tcp signal" am: 94b74699a2 am: fe673d13a6 (e7c5a2ad) · Commits · e / os / android_packages_modules_NetworkStack

src/android/net/util/DataStallUtils.java

+48 −5

Original line number	Diff line number	Diff line
		@@ -20,10 +20,11 @@ package android.net.util;
		* Collection of utilities for data stall.
		*/
		public class DataStallUtils {
		/**
		* Detect data stall via using dns timeout counts.
		*/
		public static final int DATA_STALL_EVALUATION_TYPE_DNS = 1;
		/** Detect data stall using dns timeout counts. */
		public static final int DATA_STALL_EVALUATION_TYPE_DNS = 1 << 0;
		/** Detect data stall using tcp connection fail rate. */
		public static final int DATA_STALL_EVALUATION_TYPE_TCP = 1 << 1;

		// Default configuration values for data stall detection.
		public static final int DEFAULT_CONSECUTIVE_DNS_TIMEOUT_THRESHOLD = 5;
		public static final int DEFAULT_DATA_STALL_MIN_EVALUATE_TIME_MS = 60 * 1000;
		@@ -60,13 +61,55 @@ public class DataStallUtils {
		* Type: int
		* Valid values:
		* {@link #DATA_STALL_EVALUATION_TYPE_DNS} : Use dns as a signal.
		* {@link #DATA_STALL_EVALUATION_TYPE_TCP} : Use tcp info as a signal.
		*/
		public static final String CONFIG_DATA_STALL_EVALUATION_TYPE = "data_stall_evaluation_type";
		public static final int DEFAULT_DATA_STALL_EVALUATION_TYPES = DATA_STALL_EVALUATION_TYPE_DNS;
		public static final int DEFAULT_DATA_STALL_EVALUATION_TYPES =
		DATA_STALL_EVALUATION_TYPE_DNS \| DATA_STALL_EVALUATION_TYPE_TCP;
		// The default number of DNS events kept of the log kept for dns signal evaluation. Each event
		// is represented by a {@link com.android.server.connectivity.NetworkMonitor#DnsResult} objects.
		// It's also the size of array of {@link com.android.server.connectivity.nano.DnsEvent} kept in
		// metrics. Note that increasing the size may cause statsd log buffer bust. Need to check the
		// design in statsd when you try to increase the size.
		public static final int DEFAULT_DNS_LOG_SIZE = 20;

		/**
		* The time interval for polling tcp info to observe the tcp health.
		*/
		public static String CONFIG_DATA_STALL_TCP_POLLING_INTERVAL = "data_stall_tcp_polling_interval";

		/**
		* Default polling interval to observe the tcp health.
		*/
		public static int DEFAULT_TCP_POLLING_INTERVAL_MS = 10_000;

		/**
		* Default tcp packets fail rate to suspect as a data stall.
		*
		* Calculated by ((# of packets lost)+(# of packets retrans))/(# of packets sent)*100. Ideally,
		* the percentage should be 100%. However, the ongoing packets may not be considered as neither
		* lost or retrans yet. It will cause the percentage lower.
		*/
		public static final int DEFAULT_TCP_PACKETS_FAIL_PERCENTAGE = 80;

		/**
		* The percentage of tcp packets fail rate to be suspected as a data stall.
		*
		* Type: int
		* Valid values: 0 to 100.
		*/
		public static final String CONFIG_TCP_PACKETS_FAIL_RATE = "tcp_packets_fail_rate";

		/** Corresponds to enum from bionic/libc/include/netinet/tcp.h. */
		public static final int TCP_ESTABLISHED = 1;
		public static final int TCP_SYN_SENT = 2;
		public static final int TCP_SYN_RECV = 3;
		public static final int TCP_MONITOR_STATE_FILTER =
		(1 << TCP_ESTABLISHED) \| (1 << TCP_SYN_SENT) \| (1 << TCP_SYN_RECV);

		/**
		* Threshold for the minimal tcp packets count to evaluate data stall via tcp info.
		*/
		public static final int DEFAULT_DATA_STALL_MIN_PACKETS_THRESHOLD = 10;
		public static final String CONFIG_MIN_PACKETS_THRESHOLD = "tcp_min_packets_threshold";
		}