关于对varnish的性能测试问题

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关于对varnish的性能测试问题5

我在服务器上部署了varnish，也做了对应的配置，我想知道经过缓存加速后，性能能提升多少，所以使用了http_load进行测试，使用两个脚本，一个脚本（里面只有一个URL）是访问加速后的页面，一个脚本（里面只有一个URL）是访问未加速的页面，但是经过几轮的测试，发现经过varnish进行缓存加速后，并没有提升性能，开始以为是由于访问静态页面本来就速度很快，所以绝大部分时间都是在传输上，这样的话就算varnish进行了加速，对于整个测试结果依旧没有影响，所以我又把http_load装到了服务器本地上，进行测试，结果仍旧一样，没有性能提升，所以我特想问有此方面经验的人士，能给我一些好的建议，该怎么测试。

下面是我配置的varnish的配置文件：

 backend default {
     .host = "127.0.0.1";
     .port = "8080";
     .connect_timeout = 10s;
     .first_byte_timeout = 50s;
     .between_bytes_timeout = 20s;
 }
 sub vcl_recv {
     if (req.restarts == 0) {
 	if (req.http.x-forwarded-for) {
 	    set req.http.X-Forwarded-For =
 		req.http.X-Forwarded-For + ", " + client.ip;
 	} else {
 	    set req.http.X-Forwarded-For = client.ip;
 	}
     }
     if (req.request != "GET" &&
       req.request != "HEAD" &&
       req.request != "PUT" &&
       req.request != "POST" &&
       req.request != "TRACE" &&
       req.request != "OPTIONS" &&
       req.request != "DELETE") {
         /* Non-RFC2616 or CONNECT which is weird. */
         return (pipe);
     }
     if (req.request != "GET" && req.request != "HEAD") {
         /* We only deal with GET and HEAD by default */
         return (pass);
     }
    # std.log("LOG_DEBUG:req.http.Authorization:["+req.http.Authorzation+"],req.http.Cookie:["+req.http.Cookie+"]");
    # if (req.http.Authorization || req.http.Cookie) {
    #     /* Not cacheable by default */
    #     return (pass);
    # }
    if(req.url ~ "\.(jsp|do|action)($|\?)"){
       return (pass);
    }else{
       return (lookup);
    }
 }
 
 sub vcl_pipe {
     return (pipe);
 }
 
 sub vcl_pass {
     return (pass);
 }
 
 sub vcl_hash {
     hash_data(req.url);
     if (req.http.host) {
         hash_data(req.http.host);
     } else {
         hash_data(server.ip);
     }
     return (hash);
 }
 
 sub vcl_hit {
     return (deliver);
 }
 
 sub vcl_miss {
     return (fetch);
 }
 
 sub vcl_fetch {
    #std.log("LOG_DEBUG:the Set-Cookie is "+beresp.http.Set-Cookie); 
    if(beresp.http.Set-Cookie){
        return (hit_for_pass);
    }
    if(beresp.status == 500 || beresp.status == 501 || beresp.status == 502 || beresp.status == 503 || beresp.status == 504 || beresp.status == 404){
        return(restart);
    }
    if(req.request == "GET" && req.url ~ "(news\/newsedit\.htm|news\/newsinsert\.htm|tbcardmanage\/doupload\.htm|bizsubject\/uploadcomplete\.htm|bizsubject\/typelogoupload\.htm|terminalcontro\/uploadterminalpic\.htm)$"){
       set beresp.ttl = 120 s;
      #std.log("LOG_DEBUG:enter into expection about upload!");
       return (hit_for_pass);
    }
    if(req.request == "GET" && req.url ~ "((bfapp|servlet|CrossDomainSSO|services|editor|fckeditor)|(\.subtree$))"){
       set beresp.ttl = 120 s;
       #std.log("LOG_DEBUG:enter into expection about system url!");
       return (hit_for_pass);
    }
    if(req.request == "GET" && req.url ~ "\.(css|js|html|htm|shtml)$"){
       #std.log("LOG_DEBUG:enter into set css|js|html ttl 600S");
       set beresp.ttl = 600 s;
    }
    if(req.request == "GET" && req.url ~ "\/[a-zA-Z0-9+]$"){
       std.log("LOG_DEBUG:enter into set nothing in end url ttl 600s");
       set beresp.ttl = 600 s;
    }
    if(req.request == "GET" && req.url ~ "\.(gif|jpg|jpeg|bmp|png|tiff|tif|ico|img|bmp|wmf)$"){
       set beresp.ttl = 3600 s;
    }
    if(req.request == "GET" && req.url ~ "\.(svg|swf|ico|mp3|mp4|m4a|wav|rmvb|avi|wmv)$"){
       set beresp.ttl = 10 d;
    }
    return (deliver);
 }
 
 sub vcl_deliver {
     set resp.http.X-Cache-hits = obj.hits;
     if(obj.hits > 0){
         set resp.http.X-Cache = "HIT FROM VARNISH";
     }else{
         set resp.http.X-Cache = "MISS FROM VARNISH";
     }
     return (deliver);
 }
 
 sub vcl_error {
     set obj.http.Content-Type = "text/html; charset=utf-8";
     set obj.http.Retry-After = "5";
     synthetic {"
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html>
   <head>
     <title>"} + obj.status + " " + obj.response + {"</title>
   </head>
   <body>
     <h1>Error "} + obj.status + " " + obj.response + {"</h1>
     <p>"} + obj.response + {"</p>
     <h3>Guru Meditation:</h3>
     <p>XID: "} + req.xid + {"</p>
     <hr>
     <p>Varnish cache server</p>
   </body>
 </html>
 "};
     return (deliver);
 }
 
 sub vcl_init {
 	return (ok);
 }
 
 sub vcl_fini {
 	return (ok);
 }

我想varnish据网上说性能可以提升20-30倍，我却一倍都没有提升，无外乎是配置出错或者测试不对，当然我相信我的配置文件是没有问题的，所以我怀疑是我的测试方案不正确。