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- From 4e4c8c7a1cca2125e2bf2a67cbab0bdbd78fdb86 Mon Sep 17 00:00:00 2001
- From: He Zhe <zhe.he@windriver.com>
- Date: Tue, 30 Jul 2019 13:24:22 +0800
- Subject: [PATCH] ptts: Set recv buffer size too max to receive as many
- packets as possible
- Flooding multicast may make the rcv buffer overrun and is considered
- premature messages later and thus cause the following error.
- "Ignoring premature msg 16, currently handling 12"
- This patch sets SO_RCVBUF the of socket to max int value to receive as many
- packets as possible, and give a hint to user when possible overrun occurs. Note
- that the value of SO_RCVBUF will be limited up to min(INT_MAX/2,
- sysctl_rmem_max) in kernel.
- Signed-off-by: He Zhe <zhe.he@windriver.com>
- Upstream-Status: Backport
- Signed-off-by: Li Zhou <li.zhou@windriver.com>
- ---
- ptts/tipc_ts_server.c | 18 ++++++++++++++++--
- 1 file changed, 16 insertions(+), 2 deletions(-)
- diff --git a/ptts/tipc_ts_server.c b/ptts/tipc_ts_server.c
- index a286daa..3a2f96f 100644
- --- a/ptts/tipc_ts_server.c
- +++ b/ptts/tipc_ts_server.c
- @@ -641,8 +641,9 @@ void server_mcast
- if (rc < 0)
- err("multicast message not received");
- if (msgno != *(int*) buf) {
- - dbg1("Ignoring premature msg %u, currently handling %u\n",
- - *(int*)buf, msgno);
- + dbg1("Ignoring premature msg %u, currently handling %u\n"
- + "You can enlarge /proc/sys/net/core/rmem_max and try again\n",
- + *(int*)buf, msgno);
- continue;
- }
- rc = recvfrom(sd[i], buf, expected_szs[numSubTest],
- @@ -687,8 +688,21 @@ void server_test_multicast(void)
- FD_ZERO(&readfds);
-
- for (i = 0; i < TIPC_MCAST_SOCKETS; i++) {
- + int optval = (int)(~0U >> 1);
- + socklen_t optlen = sizeof(optval);
- + int rc = 0;
- +
- sd[i] = createSocketTIPC (SOCK_RDM);
- FD_SET(sd[i], &readfds);
- +
- + /*
- + * Flooding multicast may make the rcv buffer overrun and considered premature msg later.
- + * Set SO_RCVBUF to max int value to receive as many packets as possible.
- + * Note that it will be limited up to min(INT_MAX/2, sysctl_rmem_max) in kernel.
- + */
- + rc = setsockopt(sd[i], SOL_SOCKET, SO_RCVBUF, (const char*)&optval, optlen);
- + if(rc != 0)
- + printf("Failed to set SO_RCVBUF of %d: %s\n", sd[i], strerror(errno));
- }
-
- server_bindMulticast( 0, 99, sd[0]);
- --
- 2.17.1
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