On Tuesday 20 May 2014 12:56 AM, Hans Feldt wrote:
> - I guess the commit message prefix should be "mds: "
> - I miss the use case / benefit of the proposed change in the commit message
>
> I don't understand the need for setting a default of rcvbuf and sndbuf for 
> unix domain sockets. This makes it impossible todo system wide tuning the 
> standard way using sysctl.
>
> I think setting rcvbuf and sndbuf should only be done if configured with the 
> environment variable. Otherwise system defaults should be used. In the code 
> it says " Increase the socket buffer size" which is wrong on most modern 
> Linux systems it will actuallt decrease it! On my Ubuntu system rmem_max and 
> default is 212992.
[Surya] If the system default size is less than the size of a MDS 
message, then it should be set to the value equal/just higher than the 
MDS message. For example, in MDS presently we are sending a max size of 
66000. So the socket size should be at least 66000 or higher.
>
> Thanks,
> Hans
>
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]]
>> Sent: den 19 maj 2014 06:41
>> To: [email protected]; Hans Feldt
>> Cc: [email protected]
>> Subject: [PATCH 1 of 3] dtm: upgrade the fragment size to 
>> MDS_DIRECT_BUF_MAXSIZE [#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 ++++++------
>>   3 files changed, 24 insertions(+), 9 deletions(-)
>>
>>
>> Upgrade the fragment size to MDS_DIRECT_BUF_MAXSIZE  and their is NO issue 
>> with MDS TCP in-service Upgrade ,
>> In the current code     SO_RCVBUF & SO_SNDBUF of TCP sockets was already 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.
>>
>> Note :This path is on top of Hans Feldt published   on 4-29-2014 10:58 AM.
>>
>> 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);
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