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Try accept a few times before falling back to poll

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Gives ~3% throughput improvemet in sysbench connect benchmark.

Part of MDEV-19515 - Improve connect speed
This commit is contained in:
Sergey Vojtovich
2019-05-17 20:26:49 +04:00
parent 87775402cd
commit 5d183df77b
1 changed files with 18 additions and 20 deletions
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38
sql/mysqld.cc
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@@ -6375,7 +6375,6 @@ static void set_non_blocking_if_supported(MYSQL_SOCKET sock)
void handle_connections_sockets()
{
MYSQL_SOCKET sock= mysql_socket_invalid();
MYSQL_SOCKET new_sock= mysql_socket_invalid();
uint error_count=0;
struct sockaddr_storage cAddr;
int retval;
@@ -6467,29 +6466,28 @@ void handle_connections_sockets()
for (uint retry=0; retry < MAX_ACCEPT_RETRY; retry++)
{
size_socket length= sizeof(struct sockaddr_storage);
MYSQL_SOCKET new_sock;
new_sock= mysql_socket_accept(key_socket_client_connection, sock,
(struct sockaddr *)(&cAddr),
&length);
if (mysql_socket_getfd(new_sock) != INVALID_SOCKET ||
(socket_errno != SOCKET_EINTR && socket_errno != SOCKET_EAGAIN))
break;
if (mysql_socket_getfd(new_sock) != INVALID_SOCKET)
handle_accepted_socket(new_sock, sock);
else if (socket_errno != SOCKET_EINTR && socket_errno != SOCKET_EAGAIN)
{
/*
accept(2) failed on the listening port.
There is not much details to report about the client,
increment the server global status variable.
*/
statistic_increment(connection_errors_accept, &LOCK_status);
if ((error_count++ & 255) == 0) // This can happen often
sql_perror("Error in accept");
if (socket_errno == SOCKET_ENFILE || socket_errno == SOCKET_EMFILE)
sleep(1); // Give other threads some time
break;
}
}
if (mysql_socket_getfd(new_sock) == INVALID_SOCKET)
{
/*
accept(2) failed on the listening port, after many retries.
There is not much details to report about the client,
increment the server global status variable.
*/
statistic_increment(connection_errors_accept, &LOCK_status);
if ((error_count++ & 255) == 0) // This can happen often
sql_perror("Error in accept");
if (socket_errno == SOCKET_ENFILE || socket_errno == SOCKET_EMFILE)
sleep(1); // Give other threads some time
continue;
}
handle_accepted_socket(new_sock, sock);
}
sd_notify(0, "STOPPING=1\n"
"STATUS=Shutdown in progress\n");