Commit 5090147c authored by Jian Yang's avatar Jian Yang Committed by David S. Miller
Browse files

selftests: txtimestamp: add new command-line flags. 



A longer sleep duration between sendmsg()s makes more cachelines to be
evicted and results in higher latency. Making the duration configurable.

Add the following new flags:
-S: Configurable sleep duration.
-b: Busy loop instead of poll().

Remove the following flag:
-D: No delay between packets: subsumed by -S.

Signed-off-by: default avatarJian Yang <jianyang@google.com>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 70a7ee96

tools/testing/selftests/networking/timestamping/txtimestamp.c

+15 −9
Original line number Diff line number Diff line
@@ -65,8 +65,9 @@ static int cfg_delay_snd; 
static int cfg_delay_ack;

static bool cfg_show_payload;

static bool cfg_do_pktinfo;

static bool cfg_busy_poll;

static int cfg_sleep_usec = 50 * 1000;

static bool cfg_loop_nodata;

static bool cfg_no_delay;

static bool cfg_use_cmsg;

static bool cfg_use_pf_packet;

static bool cfg_do_listen;
@@ -553,9 +554,10 @@ static void do_test(int family, unsigned int report_opt) 
			error(1, errno, "send");



		/* wait for all errors to be queued, else ACKs arrive OOO */

		if (!cfg_no_delay)

			usleep(50 * NSEC_PER_USEC);

		if (cfg_sleep_usec)

			usleep(cfg_sleep_usec);



		if (!cfg_busy_poll)

			__poll(fd);



		while (!recv_errmsg(fd)) {}
@@ -575,9 +577,9 @@ static void __attribute__((noreturn)) usage(const char *filepath) 
			"  -4:   only IPv4\n"

			"  -6:   only IPv6\n"

			"  -h:   show this message\n"

			"  -b:   busy poll to read from error queue\n"

			"  -c N: number of packets for each test\n"

			"  -C:   use cmsg to set tstamp recording options\n"

			"  -D:   no delay between packets\n"

			"  -F:   poll() waits forever for an event\n"

			"  -I:   request PKTINFO\n"

			"  -l N: send N bytes at a time\n"
@@ -588,6 +590,7 @@ static void __attribute__((noreturn)) usage(const char *filepath) 
			"  -P:   use PF_PACKET\n"

			"  -r:   use raw\n"

			"  -R:   use raw (IP_HDRINCL)\n"

			"  -S N: usec to sleep before reading error queue\n"

			"  -u:   use udp\n"

			"  -v:   validate SND delay (usec)\n"

			"  -V:   validate ACK delay (usec)\n"
@@ -601,7 +604,7 @@ static void parse_opt(int argc, char **argv) 
	int proto_count = 0;

	int c;



	while ((c = getopt(argc, argv, "46c:CDFhIl:LnNp:PrRuv:V:x")) != -1) {

	while ((c = getopt(argc, argv, "46bc:CFhIl:LnNp:PrRS:uv:V:x")) != -1) {

		switch (c) {

		case '4':

			do_ipv6 = 0;
@@ -609,15 +612,15 @@ static void parse_opt(int argc, char **argv) 
		case '6':

			do_ipv4 = 0;

			break;

		case 'b':

			cfg_busy_poll = true;

			break;

		case 'c':

			cfg_num_pkts = strtoul(optarg, NULL, 10);

			break;

		case 'C':

			cfg_use_cmsg = true;

			break;

		case 'D':

			cfg_no_delay = true;

			break;

		case 'F':

			cfg_poll_timeout = -1;

			break;
@@ -655,6 +658,9 @@ static void parse_opt(int argc, char **argv) 
			cfg_proto = SOCK_RAW;

			cfg_ipproto = IPPROTO_RAW;

			break;

		case 'S':

			cfg_sleep_usec = strtoul(optarg, NULL, 10);

			break;

		case 'u':

			proto_count++;

			cfg_proto = SOCK_DGRAM;

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