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538aaf9b23
This test populates the bhash table for a given port with MAX_THREADS * MAX_CONNECTIONS sockets, and then times how long a bind request on the port takes. When populating the bhash table, we create the sockets and then bind the sockets to the same address and port (SO_REUSEADDR and SO_REUSEPORT are set). When timing how long a bind on the port takes, we bind on a different address without SO_REUSEPORT set. We do not set SO_REUSEPORT because we are interested in the case where the bind request does not go through the tb->fastreuseport path, which is fragile (eg tb->fastreuseport path does not work if binding with a different uid). To run the test locally, I did: * ulimit -n 65535000 * ip addr add 2001:0db8:0:f101::1 dev eth0 * ./bind_bhash_test 443 Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This times how long it takes to bind to a port when the port already
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* has multiple sockets in its bhash table.
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*
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* In the setup(), we populate the port's bhash table with
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* MAX_THREADS * MAX_CONNECTIONS number of entries.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <netdb.h>
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#include <pthread.h>
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#define MAX_THREADS 600
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#define MAX_CONNECTIONS 40
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static const char *bind_addr = "::1";
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static const char *port;
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static int fd_array[MAX_THREADS][MAX_CONNECTIONS];
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static int bind_socket(int opt, const char *addr)
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{
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struct addrinfo *res, hint = {};
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int sock_fd, reuse = 1, err;
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sock_fd = socket(AF_INET6, SOCK_STREAM, 0);
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if (sock_fd < 0) {
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perror("socket fd err");
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return -1;
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}
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hint.ai_family = AF_INET6;
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hint.ai_socktype = SOCK_STREAM;
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err = getaddrinfo(addr, port, &hint, &res);
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if (err) {
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perror("getaddrinfo failed");
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return -1;
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}
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if (opt) {
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err = setsockopt(sock_fd, SOL_SOCKET, opt, &reuse, sizeof(reuse));
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if (err) {
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perror("setsockopt failed");
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return -1;
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}
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}
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err = bind(sock_fd, res->ai_addr, res->ai_addrlen);
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if (err) {
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perror("failed to bind to port");
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return -1;
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}
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return sock_fd;
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}
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static void *setup(void *arg)
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{
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int sock_fd, i;
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int *array = (int *)arg;
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for (i = 0; i < MAX_CONNECTIONS; i++) {
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sock_fd = bind_socket(SO_REUSEADDR | SO_REUSEPORT, bind_addr);
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if (sock_fd < 0)
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return NULL;
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array[i] = sock_fd;
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}
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return NULL;
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}
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int main(int argc, const char *argv[])
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{
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int listener_fd, sock_fd, i, j;
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pthread_t tid[MAX_THREADS];
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clock_t begin, end;
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if (argc != 2) {
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printf("Usage: listener <port>\n");
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return -1;
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}
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port = argv[1];
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listener_fd = bind_socket(SO_REUSEADDR | SO_REUSEPORT, bind_addr);
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if (listen(listener_fd, 100) < 0) {
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perror("listen failed");
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return -1;
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}
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/* Set up threads to populate the bhash table entry for the port */
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for (i = 0; i < MAX_THREADS; i++)
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pthread_create(&tid[i], NULL, setup, fd_array[i]);
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for (i = 0; i < MAX_THREADS; i++)
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pthread_join(tid[i], NULL);
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begin = clock();
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/* Bind to the same port on a different address */
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sock_fd = bind_socket(0, "2001:0db8:0:f101::1");
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end = clock();
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printf("time spent = %f\n", (double)(end - begin) / CLOCKS_PER_SEC);
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/* clean up */
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close(sock_fd);
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close(listener_fd);
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for (i = 0; i < MAX_THREADS; i++) {
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for (j = 0; i < MAX_THREADS; i++)
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close(fd_array[i][j]);
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}
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return 0;
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}
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