Hi, this is not too much useful, but maybe interesting: I am trying Red Hat Enterprise Linux 5 Server now and tried to install one virtualized host and benchmarked Drupal 5.1 running on Domain 0 vs. Virtualized host. The hardware is: Intel Celeron 2.8GHz, 1x 80GB IDE HDD, 1.5GB RAM Domain 0 is default installation, limited to 500MB RAM in grub Virtualized host is default installation, limited to 500MB RAM by XEN I installed PHP 5.1.4, Apache 2.2.3, MySQL 5.0.22 and Drupal 5.1 with 2000 nodes and 2000 comments on both. The results are: Domain 0: ========= Concurrency Level: 20 Time taken for tests: 9.88710 seconds Complete requests: 10000 Failed requests: 0 Write errors: 0 Non-2xx responses: 10000 Total transferred: 5510000 bytes HTML transferred: 3190000 bytes Requests per second: 1100.27 [#/sec] (mean) Time per request: 18.177 [ms] (mean) Time per request: 0.909 [ms] (mean, across all concurrent requests) Transfer rate: 591.94 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 2.0 0 29 Processing: 0 17 23.0 16 618 Waiting: 0 15 18.0 16 413 Total: 0 17 23.0 16 618 Virtualized Host: ================= Concurrency Level: 20 Time taken for tests: 13.221002 seconds Complete requests: 10000 Failed requests: 0 Write errors: 0 Non-2xx responses: 10000 Total transferred: 5510000 bytes HTML transferred: 3190000 bytes Requests per second: 756.37 [#/sec] (mean) Time per request: 26.442 [ms] (mean) Time per request: 1.322 [ms] (mean, across all concurrent requests) Transfer rate: 406.93 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 3 52.1 1 3003 Processing: 2 21 16.9 23 410 Waiting: 1 20 15.6 22 247 Total: 3 25 54.3 24 3013 Feel free to ask if anybody finds this interesting :-) Jakub http://www.drupal.cz