http://blog.darkhax.com/2009/06/08/supercharge-wordpress

post-varnish.txt

This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking blog.darkhax.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Finished 400 requests


Server Software:        Apache/2.2.8
Server Hostname:        blog.darkhax.com
Server Port:            80

Document Path:          /
Document Length:        117077 bytes

Concurrency Level:      10
Time taken for tests:   4.027 seconds
Complete requests:      400
Failed requests:        0
Write errors:           0
Total transferred:      47249752 bytes
HTML transferred:       46972774 bytes
Requests per second:    99.32 [#/sec] (mean)
Time per request:       100.682 [ms] (mean)
Time per request:       10.068 [ms] (mean, across all concurrent requests)
Transfer rate:          11457.40 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   13   2.8     13      20
Processing:    33   87   9.4     86     125
Waiting:        1   24   7.5     23      65
Total:         34   99   9.7     99     127

Percentage of the requests served within a certain time (ms)
  50%     99
  66%    102
  75%    105
  80%    106
  90%    110
  95%    113
  98%    120
  99%    123
 100%    127 (longest request)

pre-varnish.txt

This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking blog.darkhax.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Finished 400 requests


Server Software:        Apache/2.2.8
Server Hostname:        blog.darkhax.com
Server Port:            80

Document Path:          /
Document Length:        117077 bytes

Concurrency Level:      10
Time taken for tests:   112.432 seconds
Complete requests:      400
Failed requests:        1
   (Connect: 0, Receive: 0, Length: 1, Exceptions: 0)
Write errors:           0
Total transferred:      47082350 bytes
HTML transferred:       46830350 bytes
Requests per second:    3.56 [#/sec] (mean)
Time per request:       2810.809 [ms] (mean)
Time per request:       281.081 [ms] (mean, across all concurrent requests)
Transfer rate:          408.95 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.6      0       4
Processing:  1742 2802 446.6   2786    4471
Waiting:     1718 2714 417.2   2679    4346
Total:       1742 2802 446.7   2786    4471

Percentage of the requests served within a certain time (ms)
  50%   2786
  66%   2981
  75%   3130
  80%   3189
  90%   3429
  95%   3584
  98%   3753
  99%   3830
 100%   4471 (longest request)

varnish.c

# default backend config
backend webserver {
	.host = "127.0.0.1";
	.port = "81";
}

# this is the main config
sub vcl_recv {
  # do not cache POST requests
  if (req.request == "POST") {
    pipe;
  }

  # cache multimedia
  if (req.request == "GET" && req.url ~ "\.(jpg|jpeg|gif|ico|png)$") {
    lookup;
  }

  # cache other static files
  if (req.request == "GET" && req.url ~ "\.(css|js|pdf|xls|vsd|doc|ppt|iso)$") {
     lookup;
  }

  # ignore my tracks install
  if (req.http.host ~ "tracks\.darkhelmetlive\.com") {
    pipe;
  }

  # too hard
  if (req.http.Expect) {
    pipe;
  }

  if (req.http.If-None-Match) {
    pass;
  }

  # pass to backend if we have HTTP authentication
  if (req.http.Authenticate || req.http.Authorization) {
    pass;
  }

  # speed up wordpress
  if (req.http.host ~ "blog") {
    # but ignore these things, since they are outside admin
    if (req.url ~ "(one-click-plugin-updater|kimili)") {
      pipe;
    }

    # keep cookies for admin
    if (!(req.url ~ "wp-(login|admin)")) {
	    unset req.http.cookie;
    }
  }

  lookup;
}

sub vcl_hash {
  set req.hash += req.url;
  if (req.http.host) {
    set req.hash += req.http.host;
  } else {
    set req.hash += server.ip;
  }

  hash;
}

sub vcl_fetch {
  if (!obj.cacheable) {
    pass;
  }

  # Handle X-Accel-Redirect
  if (obj.http.x-accel-redirect ~ ".*") {
    set req.url = obj.http.x-accel-redirect;
    restart;
  }

  if (req.http.host ~ "blog") {
    if (!(req.url ~ "wp-(login|admin)")) {
	    unset obj.http.cookie;
    }
  }

  deliver;
}

sub vcl_hit {
  if (!obj.cacheable) {
    pass;
  }

  deliver;
}