Ok I will split and publish again with specific  Commit Message.

-AVM


On 4/29/2014 12:19 PM, Hans Feldt wrote:
> Hi,
>
> This seems like 3 different logical changes thus should be 3 different 
> patches. You should not change the MDS library in the same patch as the dtm 
> infrastructure service (unless the changes are very tightly coupled).
>
> What is the actual MDS/TCP performance improvement here and what change is 
> bringing it?
> I think it would be the increased fragmentation limit but let's be explicit 
> about it in the commit message.
>
> Thanks,
> Hans
>
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]]
>> Sent: den 29 april 2014 08:20
>> To: [email protected]; Hans Feldt; [email protected]
>> Cc: [email protected]
>> Subject: [PATCH 1 of 1] mds: TCP performance improvements [#654]
>>
>>   osaf/libs/core/mds/include/mds_dt_tcp_disc.h               |   1 -
>>   osaf/libs/core/mds/mds_dt_tcp.c                            |  20 +++++-
>>   osaf/libs/core/mds/mds_dt_trans.c                          |  12 +-
>>   osaf/services/infrastructure/dtms/config/dtmd.conf         |  23 +++++++
>>   osaf/services/infrastructure/dtms/dtm/dtm_intra.c          |  13 +--
>>   osaf/services/infrastructure/dtms/dtm/dtm_node_sockets.c   |  44 
>> ++++++-------
>>   osaf/services/infrastructure/dtms/dtm/dtm_read_config.c    |  30 +++++++++
>>   osaf/services/infrastructure/dtms/include/dtm.h            |   2 +
>>   osaf/services/infrastructure/dtms/include/dtm_cb.h         |   3 +
>>   osaf/services/infrastructure/dtms/include/dtm_intra_disc.h |   2 -
>>   10 files changed, 109 insertions(+), 41 deletions(-)
>>
>>
>> This path is on top of Hans Feldt published   on
>> 4/29/2014 10:58 AM
>>
>> 1) Their is NO issue with MDS TCP in-service Upgrade ,The value of
>>     SO_RCVBUF & SO_SNDBUF of TCP sockets was set to 64000 (MDS_SND_RCV_SIZE)
>>     using setsockopt() ,the kernel doubles this value ,and this doubled
>>     value is returned by getsockopt(). So MDS_DIRECT_BUF_MAXSIZE size is 
>> used to send for for both
>>     previous & current versions of Opensaf nodes which are using MDS TCP as 
>> transport
>>
>> 2) Made DTM-TCP inter-node & intra-node socket SO_SNDBUF and
>>     SO_RCVBUF buffer in bytes configurable . The kernel doubles this value 
>> (to
>>     allow space for bookkeeping over-head) when it is set using 
>> setsockopt(),and
>>     this doubled value is returned by getsockopt(). The default value is
>>     set to DTM_SOCK_SND_RCV_BUF_SIZE=126976
>>
>> 3) Made TCP_NODELAY configurable to specifi whether MDS TCP
>>     transport should follow the Nagle algorithm for deciding when to send 
>> data.By
>>     default, TCP will follow the Nagle algorithm is disable this behavior , 
>> can be
>>     configured to TRUE(1) or FALSE(0)
>>
>> diff --git a/osaf/libs/core/mds/include/mds_dt_tcp_disc.h 
>> b/osaf/libs/core/mds/include/mds_dt_tcp_disc.h
>> --- a/osaf/libs/core/mds/include/mds_dt_tcp_disc.h
>> +++ b/osaf/libs/core/mds/include/mds_dt_tcp_disc.h
>> @@ -70,7 +70,6 @@ server_instance_upper + sub_ref_val + su
>>   #define MDS_SND_VERSION 1
>>   #define MDS_RCV_IDENTIFIRE 0x56123456
>>   #define MDS_RCV_VERSION 1
>> -#define DTM_INTRANODE_MSG_SIZE 1500
>>   #define DTM_INTRANODE_UNSENT_MSG 200
>>
>>   #define MDS_MDTM_LOWER_INSTANCE 0x00000000
>> diff --git a/osaf/libs/core/mds/mds_dt_tcp.c 
>> b/osaf/libs/core/mds/mds_dt_tcp.c
>> --- a/osaf/libs/core/mds/mds_dt_tcp.c
>> +++ b/osaf/libs/core/mds/mds_dt_tcp.c
>> @@ -38,7 +38,6 @@
>>   #include <configmake.h>
>>
>>   #define MDS_MDTM_SUN_PATH 255
>> -#define MDS_SND_RCV_SIZE 64000
>>   #define MDS_MDTM_CONNECT_PATH PKGLOCALSTATEDIR "/osaf_dtm_intra_server"
>>
>>   #ifndef MDS_PORT_NUMBER
>> @@ -53,6 +52,9 @@
>>   /* Send_buffer_size + MDS_MDTM_DTM_PID_BUFFER_SIZE   */
>>   #define MDS_MDTM_DTM_PID_BUFFER_SIZE (2 + MDS_MDTM_DTM_PID_SIZE)
>>
>> +/* The default value is set by the rmem_default/wmem_default  */
>> +#define MDS_SOCK_SND_RCV_BUF_SIZE 126976
>> +
>>   extern uint32_t mdtm_num_subscriptions;
>>   extern MDS_SUBTN_REF_VAL mdtm_handle;
>>   extern uint32_t mdtm_global_frag_num_tcp;
>> @@ -79,11 +81,12 @@ uint32_t mdtm_process_recv_events_tcp(vo
>>   uint32_t mds_mdtm_init_tcp(NODE_ID nodeid, uint32_t *mds_tcp_ref)
>>   {
>>      uint32_t flags;
>> -    uint32_t size = MDS_SND_RCV_SIZE;
>> +    uint32_t size = MDS_SOCK_SND_RCV_BUF_SIZE;
>>      struct sockaddr_un server_addr_un, dhserver_addr_un;
>>      struct sockaddr_in server_addr_in;
>>      struct sockaddr_in6 server_addr_in6;
>>      uint8_t buffer[MDS_MDTM_DTM_PID_BUFFER_SIZE];
>> +    char *ptr;
>>
>>      mdtm_pid = getpid();
>>
>> @@ -116,6 +119,19 @@ uint32_t mds_mdtm_init_tcp(NODE_ID nodei
>>              syslog(LOG_ERR, "MDS:MDTM:TCP ncs_patricia_tree_init failed 
>> MDTM_INIT\n");
>>              return NCSCC_RC_FAILURE;
>>      }
>> +
>> +    /*  setting MDS_SOCK_SND_RCV_BUF_SIZE  from environment variable if 
>> given.
>> +        The default value is set to MDS_SOCK_SND_RCV_BUF_SIZE (126976).
>> +        based on application requirements user need to  export 
>> MDS_SOCK_SND_RCV_BUF_SIZE
>> +        varible.
>> +
>> +        If MDS_SOCK_SND_RCV_BUF_SIZE exported to new value
>> +        it is also mandatory to  change `DTM_SOCK_SND_RCV_BUF_SIZE=` with  
>> the same value of
>> +        for example if we export MDS_SOCK_SND_RCV_BUF_SIZE=16777216
>> +        DTM_SOCK_SND_RCV_BUF_SIZE=16777216 also need to be changed in 
>> /etc/opensaf/dtm.conf */
>> +    if ((ptr = getenv("MDS_SOCK_SND_RCV_BUF_SIZE")) != NULL) {
>> +            size = atoi(ptr);
>> +    }
>>
>>      /* Create the sockets required for Binding, Send, receive and Discovery 
>> */
>>
>> diff --git a/osaf/libs/core/mds/mds_dt_trans.c 
>> b/osaf/libs/core/mds/mds_dt_trans.c
>> --- a/osaf/libs/core/mds/mds_dt_trans.c
>> +++ b/osaf/libs/core/mds/mds_dt_trans.c
>> @@ -41,7 +41,7 @@
>>
>>   #define SUM_MDS_HDR_PLUS_MDTM_HDR_PLUS_LEN_TCP ((2 + MDS_SEND_ADDRINFO_TCP 
>> + MDTM_FRAG_HDR_LEN_TCP +
>> MDS_HDR_LEN_TCP))
>>
>> -#define MDTM_MAX_SEND_PKT_SIZE_TCP
>> (MDTM_NORMAL_MSG_FRAG_SIZE+SUM_MDS_HDR_PLUS_MDTM_HDR_PLUS_LEN_TCP)   /* 
>> Includes the 30 header
>> bytes(2+8+20) */
>> +#define MDTM_MAX_SEND_PKT_SIZE_TCP   
>> (MDS_DIRECT_BUF_MAXSIZE+SUM_MDS_HDR_PLUS_MDTM_HDR_PLUS_LEN_TCP)
>>      /* Includes the 30 header bytes(2+8+20) */
>>
>>   uint32_t mdtm_global_frag_num_tcp;
>>   extern struct pollfd pfd[2];
>> @@ -363,16 +363,16 @@ static uint32_t mdtm_frag_and_send_tcp(M
>>
>>      len = m_MMGR_LINK_DATA_LEN(usrbuf);     /* Getting total len */
>>
>> -    if (len > (32767 * MDTM_NORMAL_MSG_FRAG_SIZE)) {        /* We have 15 
>> bits for frag number so 2( pow 15) -1=32767 */
>> +    if (len > (32767 * MDS_DIRECT_BUF_MAXSIZE)) {   /* We have 15 bits for 
>> frag number so 2( pow 15) -1=32767 */
>>              m_MDS_LOG_CRITICAL
>>                  ("MDTM: App. is trying to send data more than MDTM Can 
>> fragment and send, Max size is =%d\n",
>> -                 32767 * MDTM_NORMAL_MSG_FRAG_SIZE);
>> +                 32767 * MDS_DIRECT_BUF_MAXSIZE);
>>              m_MMGR_FREE_BUFR_LIST(usrbuf);
>>              return NCSCC_RC_FAILURE;
>>      }
>>
>>      while (len != 0) {
>> -            if (len > MDTM_NORMAL_MSG_FRAG_SIZE) {
>> +            if (len > MDS_DIRECT_BUF_MAXSIZE) {
>>                      if (i == 1) {
>>                              len_buf = MDTM_MAX_SEND_PKT_SIZE_TCP;
>>                              frag_val = MORE_FRAG_BIT | i;
>> @@ -552,7 +552,7 @@ uint32_t mds_mdtm_send_tcp(MDTM_SEND_REQ
>>                              m_MDS_LOG_INFO("MDTM: User Sending Data 
>> lenght=%d Fr_svc=%d to_svc=%d\n", len,
>>                                             req->src_svc_id, 
>> req->dest_svc_id);
>>
>> -                            if (len > MDTM_NORMAL_MSG_FRAG_SIZE) {
>> +                            if (len > MDS_DIRECT_BUF_MAXSIZE) {
>>                                      /* Packet needs to be fragmented and 
>> send */
>>                                      status = mdtm_frag_and_send_tcp(req, 
>> frag_seq_num, id);
>>                                      return status;
>> @@ -678,7 +678,7 @@ void mdtm_process_poll_recv_data_tcp(voi
>>                      /* Receive all incoming data on this socket */
>>                      
>> /*******************************************************/
>>
>> -                    recd_bytes = recv(tcp_cb->DBSRsock, tcp_cb->len_buff, 
>> 2, 0);
>> +                    recd_bytes = recv(tcp_cb->DBSRsock, tcp_cb->len_buff, 
>> 2, MSG_NOSIGNAL);
>>                      if (0 == recd_bytes) {
>>                              LOG_ER("MDTM:socket_recv() = %d, conn lost with 
>> dh server, exiting library err :%s", recd_bytes,
>> strerror(errno));
>>                              close(tcp_cb->DBSRsock);
>> diff --git a/osaf/services/infrastructure/dtms/config/dtmd.conf 
>> b/osaf/services/infrastructure/dtms/config/dtmd.conf
>> --- a/osaf/services/infrastructure/dtms/config/dtmd.conf
>> +++ b/osaf/services/infrastructure/dtms/config/dtmd.conf
>> @@ -72,4 +72,27 @@ DTM_TCP_KEEPALIVE_INTVL=1
>>   # Optional
>>   DTM_TCP_KEEPALIVE_PROBES=2
>>
>> +#
>> +#Used to Set the dtm internode & intranode  socket SO_SNDBUF/SO_RCVBUF 
>> buffer in bytes.
>> +#The kernel doubles this value (to allow space for bookkeeping over-head)
>> +#when it is set using setsockopt(),and this doubled value is returned  by
>> +#getsockopt(). The default value is set by the rmem_default/wmem_default
>> +#sysctl and the maximum allowed value is set by the rmem_max/wmem_max 
>> sysctl.
>> +#
>> +# IMP NOTE : If DTM_SOCK_SND_RCV_BUF_SIZE  is configured according to 
>> application requirements ,
>> +#it is also mandatory to  export `MDS_SOCK_SND_RCV_BUF_SIZE=` with  the 
>> same value of
>> +#for example if set as DTM_SOCK_SND_RCV_BUF_SIZE=16777216 need to do :
>> +#export MDS_SOCK_SND_RCV_BUF_SIZE=16777216
>> +DTM_SOCK_SND_RCV_BUF_SIZE=126976
>>
>> +#
>> +#Specifies whether MDS TCP transport should follow the Nagle algorithm for
>> +#deciding when to send data.By default, TCP will follow the Nagle algorithm 
>> is disable
>> +#this behavior,MDS TCP transport can enable TCP_NODELAY to force
>> +#TCP to always send data immediately.For example,TCP_NODELAY should be used
>> +#when there is an application using TCP for a request/response.
>> +#This option is only supported for sockets with an address family
>> +#of AF_INET or AF_INET6 (internode )and type of SOCK_STREAM
>> +# TRUE(1) or FALSE(0)
>> +DTM_TCP_NODELAY_FLAG=1
>> +
>> diff --git a/osaf/services/infrastructure/dtms/dtm/dtm_intra.c 
>> b/osaf/services/infrastructure/dtms/dtm/dtm_intra.c
>> --- a/osaf/services/infrastructure/dtms/dtm/dtm_intra.c
>> +++ b/osaf/services/infrastructure/dtms/dtm/dtm_intra.c
>> @@ -42,7 +42,6 @@ DTM_INTRANODE_CB *dtm_intranode_cb = NUL
>>
>>   #define DTM_INTRANODE_MAX_PROCESSES   100
>>   #define DTM_INTRANODE_POLL_TIMEOUT 20000
>> -#define DTM_RECV_BUFFER_SIZE 1500
>>   #define DTM_INTRANODE_TASKNAME  "DTM_INTRANODE"
>>   #define DTM_INTRANODE_STACKSIZE  NCS_STACKSIZE_HUGE
>>
>> @@ -58,7 +57,7 @@ static struct pollfd pfd_list[DTM_INTRAN
>>
>>   static int  dtm_intranode_max_fd;
>>
>> -static uint32_t dtm_intra_processing_init(char *node_ip, DTM_IP_ADDR_TYPE 
>> i_addr_family);
>> +static uint32_t dtm_intra_processing_init(char *node_ip, DTM_IP_ADDR_TYPE 
>> i_addr_family, int32_t sock_snd_rcv_buf_size);
>>   static void dtm_intranode_processing(void);
>>   static uint32_t dtm_intranode_add_poll_fdlist(int fd, uint16_t event);
>>   static uint32_t dtm_intranode_create_rcv_task(int task_hdl);
>> @@ -79,10 +78,9 @@ uint32_t dtm_socket_domain = AF_UNIX;
>>    */
>>   uint32_t dtm_service_discovery_init(DTM_INTERNODE_CB *dtms_cb)
>>   {
>> -    return dtm_intra_processing_init(dtms_cb->ip_addr, 
>> dtms_cb->i_addr_family);
>> +    return dtm_intra_processing_init(dtms_cb->ip_addr, 
>> dtms_cb->i_addr_family, dtms_cb->sock_snd_rcv_buf_size);
>>   }
>>
>> -#define DTM_INTRANODE_SOCK_SIZE 64000
>>
>>   /**
>>    * Function to init the intranode processing
>> @@ -92,10 +90,10 @@ uint32_t dtm_service_discovery_init(DTM_
>>    * @return NCSCC_RC_FAILURE
>>    *
>>    */
>> -uint32_t dtm_intra_processing_init(char *node_ip, DTM_IP_ADDR_TYPE 
>> i_addr_family)
>> +uint32_t dtm_intra_processing_init(char *node_ip, DTM_IP_ADDR_TYPE 
>> i_addr_family, int32_t sock_snd_rcv_buf_size)
>>   {
>>
>> -    int servlen, size = DTM_INTRANODE_SOCK_SIZE;    /* For socket fd and 
>> server len */
>> +    int servlen, size = sock_snd_rcv_buf_size;      /* For socket fd and 
>> server len */
>>      struct sockaddr_un serv_addr;   /* For Unix Sock address */
>>      char server_ux_name[255];
>>      NCS_PATRICIA_PARAMS pat_tree_params;
>> @@ -112,6 +110,7 @@ uint32_t dtm_intra_processing_init(char
>>              return NCSCC_RC_FAILURE;
>>      }
>>      dtm_intranode_cb->sock_domain = dtm_socket_domain;
>> +    dtm_intranode_cb->sock_snd_rcv_buf_size = sock_snd_rcv_buf_size;
>>
>>      /* Open a socket, If socket opens to fail return Error */
>>      dtm_intranode_cb->server_sockfd = socket(dtm_socket_domain, 
>> SOCK_STREAM, 0);
>> @@ -894,7 +893,7 @@ static uint32_t dtm_intranode_process_in
>>   {
>>       int flags;
>>      /* Accept processing */
>> -    int accept_fd = 0,  retry_count = 0, size = DTM_INTRANODE_SOCK_SIZE;
>> +    int accept_fd = 0,  retry_count = 0, size = 
>> dtm_intranode_cb->sock_snd_rcv_buf_size;
>>      socklen_t len = sizeof(struct sockaddr_un);
>>      struct sockaddr_un cli_addr;
>>      /* Accept should be non_block */
>> diff --git a/osaf/services/infrastructure/dtms/dtm/dtm_node_sockets.c
>> b/osaf/services/infrastructure/dtms/dtm/dtm_node_sockets.c
>> --- a/osaf/services/infrastructure/dtms/dtm/dtm_node_sockets.c
>> +++ b/osaf/services/infrastructure/dtms/dtm/dtm_node_sockets.c
>> @@ -26,7 +26,6 @@
>>
>>   #define MYPORT "6900"
>>   #define MAXBUFLEN 100
>> -#define DTM_INTERNODE_SOCK_SIZE 64000
>>
>>   struct addrinfo *mcast_sender_addr;        /* Holder for mcast_sender_addr 
>> address */
>>
>> @@ -431,7 +430,7 @@ uint32_t dtm_comm_socket_send(int sock_d
>>      int rtn = 0;
>>      int err = 0;
>>      int rc = NCSCC_RC_SUCCESS;
>> -    rtn = send(sock_desc, (raw_type *) buffer, buffer_len, 0);
>> +    rtn = send(sock_desc, (raw_type *) buffer, buffer_len, MSG_NOSIGNAL);
>>      err = errno;
>>      if (rtn < 0) {
>>              if (!IS_BLOCKIN_ERROR(err)) {
>> @@ -508,7 +507,7 @@ static char *comm_get_foreign_address(in
>>   int comm_socket_setup_new(DTM_INTERNODE_CB * dtms_cb, const char 
>> *foreign_address, in_port_t foreign_port,
>>                        DTM_IP_ADDR_TYPE ip_addr_type)
>>   {
>> -    int sock_desc = -1, size = DTM_INTERNODE_SOCK_SIZE;
>> +    int sock_desc = -1, size = dtms_cb->sock_snd_rcv_buf_size;
>>      int err = 0, rv;
>>      char local_port_str[INET6_ADDRSTRLEN];
>>      struct addrinfo *addr_list;
>> @@ -578,12 +577,12 @@ int comm_socket_setup_new(DTM_INTERNODE_
>>              goto done;
>>      }
>>
>> -        int flag = 1;
>> -        if (setsockopt(sock_desc, IPPROTO_TCP, TCP_NODELAY, (void *)&flag, 
>> sizeof(flag)) != 0) {
>> -                LOG_ER("DTM:Socket TCP_NODELAY set failed err :%s", 
>> strerror(errno));
>> -                dtm_comm_socket_close(&sock_desc);
>> -                goto done;
>> -        }
>> +    int flag = dtms_cb->tcp_nodelay_flag;
>> +    if (setsockopt(sock_desc, IPPROTO_TCP, TCP_NODELAY, (void *)&flag, 
>> sizeof(flag)) != 0) {
>> +            LOG_ER("DTM:Socket TCP_NODELAY set failed err :%s", 
>> strerror(errno));
>> +            dtm_comm_socket_close(&sock_desc);
>> +            goto done;
>> +    }
>>
>>      if (NCSCC_RC_SUCCESS != set_keepalive(dtms_cb, sock_desc)) {
>>              LOG_ER("DTM :set_keepalive failed ");
>> @@ -660,7 +659,7 @@ uint32_t dtm_stream_nonblocking_listener
>>      struct addrinfo addr_criteria;  /* Criteria for address match */
>>      char local_port_str[6];
>>      struct addrinfo *addr_list = NULL, *p;; /* List of serv addresses */
>> -    int size = DTM_INTERNODE_SOCK_SIZE;
>> +    int size = dtms_cb->sock_snd_rcv_buf_size;
>>      int rv;
>>      char ip_addr_eth[INET6_ADDRSTRLEN + IFNAMSIZ];
>>      dtms_cb->stream_sock = -1;
>> @@ -728,11 +727,11 @@ uint32_t dtm_stream_nonblocking_listener
>>              LOG_ER("DTM:Socket snd buf size set failed err :%s", 
>> strerror(errno));
>>      }
>>
>> -        int flag = 1;
>> -        if (setsockopt(dtms_cb->stream_sock, IPPROTO_TCP, TCP_NODELAY, 
>> (void *)&flag, sizeof(flag)) != 0) {
>> -                LOG_ER("DTM:Socket TCP_NODELAY set failed err :%s", 
>> strerror(errno));
>> -                dtm_sockdesc_close(dtms_cb->stream_sock);
>> -                return NCSCC_RC_FAILURE;
>> +    int flag = dtms_cb->tcp_nodelay_flag;
>> +    if (setsockopt(dtms_cb->stream_sock, IPPROTO_TCP, TCP_NODELAY, (void 
>> *)&flag, sizeof(flag)) != 0) {
>> +            LOG_ER("DTM:Socket TCP_NODELAY set failed err :%s", 
>> strerror(errno));
>> +            dtm_sockdesc_close(dtms_cb->stream_sock);
>> +            return NCSCC_RC_FAILURE;
>>           }
>>
>>      if (set_keepalive(dtms_cb, dtms_cb->stream_sock) != NCSCC_RC_SUCCESS) {
>> @@ -1249,7 +1248,6 @@ int dtm_process_connect(DTM_INTERNODE_CB
>>
>>   }
>>
>> -#define DTM_INTERNODE_SOCK_SIZE 64000
>>
>>   /**
>>    * Function for dtm accept the connection
>> @@ -1270,7 +1268,7 @@ int dtm_process_accept(DTM_INTERNODE_CB
>>      int err = 0;
>>      DTM_NODE_DB node;
>>      DTM_NODE_DB *new_node;
>> -    int new_conn_sd, size = DTM_INTERNODE_SOCK_SIZE;
>> +    int new_conn_sd, size = dtms_cb->sock_snd_rcv_buf_size;
>>      const struct sockaddr *clnt_addr1 = (struct sockaddr *)&clnt_addr;
>>      TRACE_ENTER();
>>
>> @@ -1298,12 +1296,12 @@ int dtm_process_accept(DTM_INTERNODE_CB
>>              goto done;
>>      }
>>
>> -        int flag = 1;
>> -        if (setsockopt(new_conn_sd, IPPROTO_TCP, TCP_NODELAY, (void 
>> *)&flag, sizeof(flag)) != 0) {
>> -                LOG_ER("DTM:Socket TCP_NODELAY set failed err :%s", 
>> strerror(errno));
>> -                dtm_comm_socket_close(&new_conn_sd);
>> -                goto done;
>> -        }
>> +    int flag = dtms_cb->tcp_nodelay_flag;
>> +    if (setsockopt(new_conn_sd, IPPROTO_TCP, TCP_NODELAY, (void *)&flag, 
>> sizeof(flag)) != 0) {
>> +            LOG_ER("DTM:Socket TCP_NODELAY set failed err :%s", 
>> strerror(errno));
>> +            dtm_comm_socket_close(&new_conn_sd);
>> +            goto done;
>> +    }
>>
>>      if (NCSCC_RC_SUCCESS != set_keepalive(dtms_cb, new_conn_sd)) {
>>              LOG_ER("DTM:set_keepalive failed ");
>> diff --git a/osaf/services/infrastructure/dtms/dtm/dtm_read_config.c 
>> b/osaf/services/infrastructure/dtms/dtm/dtm_read_config.c
>> --- a/osaf/services/infrastructure/dtms/dtm/dtm_read_config.c
>> +++ b/osaf/services/infrastructure/dtms/dtm/dtm_read_config.c
>> @@ -94,6 +94,10 @@ void dtm_print_config(DTM_INTERNODE_CB *
>>      TRACE("  %d", config->initial_dis_timeout);
>>      TRACE("  DTM_BCAST_FRE_MSECS: ");
>>      TRACE("  %d", config->bcast_msg_freq);
>> +    TRACE("  DTM_SOCK_SND_RCV_BUF_SIZE: ");
>> +    TRACE("  %d", config->sock_snd_rcv_buf_size);
>> +    TRACE("  DTM_TCP_NODELAY_FLAG: ");
>> +    TRACE("  %d", config->tcp_nodelay_flag);
>>      TRACE("DTM : ");
>>   }
>>
>> @@ -220,6 +224,8 @@ int dtm_read_config(DTM_INTERNODE_CB * c
>>      config->i_addr_family = DTM_IP_ADDR_TYPE_IPV4;
>>      config->bcast_msg_freq = BCAST_FRE;
>>      config->initial_dis_timeout = DIS_TIME_OUT;
>> +    config->sock_snd_rcv_buf_size = DTM_SOCK_SND_RCV_BUF_SIZE;
>> +    config->tcp_nodelay_flag = true;
>>      config->mcast_flag = false;
>>      config->scope_link = false;
>>      config->node_id = m_NCS_GET_NODE_ID;
>> @@ -424,6 +430,30 @@ int dtm_read_config(DTM_INTERNODE_CB * c
>>                              tag_len = 0;
>>
>>                      }
>> +                    if (strncmp(line, "DTM_SOCK_SND_RCV_BUF_SIZE=", 
>> strlen("DTM_SOCK_SND_RCV_BUF_SIZE=")) == 0) {
>> +                            tag_len = strlen("DTM_SOCK_SND_RCV_BUF_SIZE=");
>> +                            config->sock_snd_rcv_buf_size = 
>> atoi(&line[tag_len]);
>> +                            if (config->sock_snd_rcv_buf_size < 126976) {
>> +                                    LOG_ER("DTM: DTM_SOCK_SND_RCV_BUF_SIZE  
>> must be greater than
>> rmem_default/wmem_default sysctl of dtmd.conf");
>> +                                    return -1;
>> +                            }
>> +
>> +                            tag = 0;
>> +                            tag_len = 0;
>> +
>> +                    }
>> +
>> +                    if (strncmp(line, "DTM_TCP_NODELAY_FLAG=", 
>> strlen("DTM_TCP_NODELAY_FLAG=")) == 0) {
>> +                            tag_len = strlen("DTM_TCP_NODELAY_FLAG=");
>> +                            config->tcp_nodelay_flag = atoi(&line[tag_len]);
>> +                            if (config->tcp_nodelay_flag < 0 || 
>> config->tcp_nodelay_flag > 1) {
>> +                                    LOG_ER("DTM: DTM_TCP_NODELAY_FLAG  
>> needs to be 0 or 1 of dtmd.conf ");
>> +                                    return -1;
>> +                            }
>> +                            tag = 0;
>> +                            tag_len = 0;
>> +
>> +                    }
>>              }
>>
>>              memset(line, 0, DTM_MAX_TAG_LEN);
>> diff --git a/osaf/services/infrastructure/dtms/include/dtm.h 
>> b/osaf/services/infrastructure/dtms/include/dtm.h
>> --- a/osaf/services/infrastructure/dtms/include/dtm.h
>> +++ b/osaf/services/infrastructure/dtms/include/dtm.h
>> @@ -37,6 +37,8 @@ extern uint8_t initial_discovery_phase;
>>   #define m_NODE_DISCOVERY_TASKNAME       "NODE_DISCOVERY"
>>   #define m_NODE_DISCOVERY_STACKSIZE       NCS_STACKSIZE_HUGE
>>
>> +/* The default value of SO_RCVBUF & SO_SNDBUF , it is set by the 
>> rmem_default/wmem_default  */
>> +#define DTM_SOCK_SND_RCV_BUF_SIZE 126976
>>   #define DTM_MAX_TAG_LEN    256
>>
>>   typedef enum {
>> diff --git a/osaf/services/infrastructure/dtms/include/dtm_cb.h 
>> b/osaf/services/infrastructure/dtms/include/dtm_cb.h
>> --- a/osaf/services/infrastructure/dtms/include/dtm_cb.h
>> +++ b/osaf/services/infrastructure/dtms/include/dtm_cb.h
>> @@ -90,6 +90,8 @@ typedef struct dtm_internode_cb {
>>      int comm_keepidle_time;
>>      int comm_keepalive_intvl;
>>      int comm_keepalive_probes;
>> +    int32_t sock_snd_rcv_buf_size; /* The value of SO_RCVBUF & SO_SNDBUF */
>> +    uint32_t tcp_nodelay_flag;  /* The value of TCP_NODELAY Flag */
>>      SYSF_MBX mbx;
>>      int mbx_fd;
>>   } DTM_INTERNODE_CB;
>> @@ -116,6 +118,7 @@ typedef struct dtm_intranode_cb {
>>      SYSF_MBX mbx;
>>      int mbx_fd;
>>      int sock_domain;
>> +    int32_t sock_snd_rcv_buf_size; /* The value of SO_RCVBUF & SO_SNDBUF */
>>   } DTM_INTRANODE_CB;
>>
>>   extern DTM_INTRANODE_CB *dtm_intranode_cb;
>> diff --git a/osaf/services/infrastructure/dtms/include/dtm_intra_disc.h
>> b/osaf/services/infrastructure/dtms/include/dtm_intra_disc.h
>> --- a/osaf/services/infrastructure/dtms/include/dtm_intra_disc.h
>> +++ b/osaf/services/infrastructure/dtms/include/dtm_intra_disc.h
>> @@ -17,8 +17,6 @@
>>   #ifndef DTM_INTRA_DISC_H
>>   #define DTM_INTRA_DISC_H
>>
>> -#define DTM_INTRANODE_MSG_SIZE      1400
>> -#define DTM_INTERNODE_MSG_SIZE      DTM_INTRANODE_MSG_SIZE
>>
>>   /* 2 -len(0), 4 - iden(2), 1- ver(6), 1-msg type(7), 4- server_type (8),
>>                      4 -server lower(12), 4 -server lower(16), 8 -ref(20), 4 
>> - nodeid(28),


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