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https://github.com/fluencelabs/redis
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Check that tcp-backlog is matched by /proc/sys/net/core/somaxconn.
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parent
1b732c09d0
commit
c3846becae
@ -48,6 +48,7 @@
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#define HAVE_PROC_STAT 1
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#define HAVE_PROC_MAPS 1
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#define HAVE_PROC_SMAPS 1
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#define HAVE_PROC_SOMAXCONN 1
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#endif
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/* Test for task_info() */
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18
src/redis.c
18
src/redis.c
@ -1621,6 +1621,23 @@ void adjustOpenFilesLimit(void) {
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}
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}
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/* Check that server.tcp_backlog can be actually enforced in Linux according
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* to the value of /proc/sys/net/core/somaxconn, or warn about it. */
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void checkTcpBacklogSettings(void) {
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#ifdef HAVE_PROC_SOMAXCONN
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FILE *fp = fopen("/proc/sys/net/core/somaxconn","r");
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char buf[1024];
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if (!fp) return;
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if (fgets(buf,sizeof(buf),fp) != NULL) {
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int somaxconn = atoi(buf);
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if (somaxconn > 0 && somaxconn < server.tcp_backlog) {
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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);
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}
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}
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fclose(fp);
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#endif
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}
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/* Initialize a set of file descriptors to listen to the specified 'port'
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* binding the addresses specified in the Redis server configuration.
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*
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@ -3648,6 +3665,7 @@ int main(int argc, char **argv) {
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#ifdef __linux__
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linuxMemoryWarnings();
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#endif
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checkTcpBacklogSettings();
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loadDataFromDisk();
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if (server.cluster_enabled) {
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if (verifyClusterConfigWithData() == REDIS_ERR) {
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