1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
Description: Dynamically increase the TCP backlog on high core-count systems
Author: Shay Gal-On <sgalon@caviumnetworks.com>
Origin: other, https://bugs.launchpad.net/ubuntu/+source/lmbench/+bug/1706735
Bug-Ubuntu: https://bugs.launchpad.net/bugs/1706735
Forwarded: no
Last-Update: 2017-09-13
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
Index: lmbench/src/lib_tcp.c
===================================================================
--- lmbench.orig/src/lib_tcp.c
+++ lmbench/src/lib_tcp.c
@@ -7,6 +7,7 @@
*/
#define _LIB /* bench.h needs this */
#include "bench.h"
+#include <unistd.h>
/*
* Get a TCP socket, bind it, figure out the port,
@@ -17,7 +18,7 @@
int
tcp_server(int prog, int rdwr)
{
- int sock;
+ int sock, np, backlog = 100;
struct sockaddr_in s;
#ifdef LIBTCP_VERBOSE
@@ -37,7 +38,12 @@ tcp_server(int prog, int rdwr)
perror("bind");
exit(2);
}
- if (listen(sock, 100) < 0) {
+ /* Increase the backlog dynamically if we're on a system with a
+ large number of cores to avoid hangs. */
+ np = sysconf(_SC_NPROCESSORS_ONLN);
+ if (np * 4 > backlog)
+ backlog = np * 4;
+ if (listen(sock, backlog) < 0) {
perror("listen");
exit(4);
}
|
