nginx代理tomcat下访问慢?报错

我在tomcat下放了一个jenkins.war，启动tomcat, 可以正常访问jenkins，不慢。

现在我想使用nginx代理tomcat,当访问http://localhost/jenkins/的时候，自动转向hppt://locahost:8080/jenkins/ ，

出现的问题：访问太慢太慢了。可以排除是tomcat的问题。应该是nginx配置的问题。

nginx配置文件如下：

#user  nobody;
worker_processes  1;


#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
#pid        logs/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    #server_names_hash_bucket_size 64;
    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';


    #access_log  logs/access.log  main;
    sendfile        on;
    #tcp_nopush     on;
    #keepalive_timeout  0;
    keepalive_timeout  65;


    #开启压缩功能，节省带宽，提高响应，但是会占CPU
    gzip              on;
    gzip_min_length      1000;
    #压缩指定的文件类型
    gzip_types        text/plain text/css application/x-javascript;


    large_client_header_buffers 4 16k;
    client_max_body_size    50m;
    client_body_buffer_size 256k;
    client_header_timeout 3m;
    client_body_timeout 3m;
    send_timeout 3m;
    proxy_connect_timeout   300s;
    proxy_send_timeout      300s;
    proxy_read_timeout      300s;
    proxy_buffer_size       64k;
    proxy_buffers           4 32k;
    proxy_busy_buffers_size 64k;
    proxy_temp_file_write_size 128k;
    proxy_ignore_client_abort on;
    server {
        listen       80 ;
        server_name  127.0.0.1;
        #charset koi8-r;
        #access_log  logs/host.access.log  main;

        location /jenkins {
            #代理到本机上的8080端口，没有做负载
            proxy_pass http://localhost:8080;
            proxy_redirect          off;
            proxy_set_header        Host $host;
            proxy_set_header        X-Real-IP $remote_addr;
            proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
           root   html;
        }
    }
}

是不是我的location配置错了？还是proxy配置错了。

报错信息如下

2015/11/30 10:00:32 [error] 2688#4960: *89 upstream timed out (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.1, request: "POST /jenkins/ajaxExecutors HTTP/1.1", upstream: "http://[::1]:8080/jenkins/ajaxExecutors", host: "localhost", referrer: "http://localhost/jenkins/"

部门请求资源会报这个错误。