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Check that tcp-backlog is matched by /proc/sys/net/core/somaxconn.

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This commit is contained in:
antirez 2014-12-04 10:54:31 +01:00
parent 1b732c09d0
commit c3846becae
2 changed files with 19 additions and 0 deletions
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1
src/config.h
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@ -48,6 +48,7 @@
#define HAVE_PROC_STAT 1
#define HAVE_PROC_MAPS 1
#define HAVE_PROC_SMAPS 1
#define HAVE_PROC_SOMAXCONN 1
#endif
/* Test for task_info() */

18
src/redis.c
View File

@ -1621,6 +1621,23 @@ void adjustOpenFilesLimit(void) {
}
}
/* Check that server.tcp_backlog can be actually enforced in Linux according
* to the value of /proc/sys/net/core/somaxconn, or warn about it. */
void checkTcpBacklogSettings(void) {
#ifdef HAVE_PROC_SOMAXCONN
FILE *fp = fopen("/proc/sys/net/core/somaxconn","r");
char buf[1024];
if (!fp) return;
if (fgets(buf,sizeof(buf),fp) != NULL) {
int somaxconn = atoi(buf);
if (somaxconn > 0 && somaxconn < server.tcp_backlog) {
redisLog(REDIS_WARNING,"WARNING: The TCP backlog setting of %d cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of %d.", server.tcp_backlog, somaxconn);
}
}
fclose(fp);
#endif
}
/* Initialize a set of file descriptors to listen to the specified 'port'
* binding the addresses specified in the Redis server configuration.
*
@ -3648,6 +3665,7 @@ int main(int argc, char **argv) {
#ifdef __linux__
linuxMemoryWarnings();
#endif
checkTcpBacklogSettings();
loadDataFromDisk();
if (server.cluster_enabled) {
if (verifyClusterConfigWithData() == REDIS_ERR) {