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From Gilles Ganault <>
Subject [users@httpd] [A2/Load balancing] mod_proxy vs. dedicated box?
Date Tue, 02 Sep 2008 21:53:02 GMT

I'd like some feedback about using Apache's mod_proxy to provide load
balancing with other Apache2 servers vs. using a dedicated device.

At this point, our first Apache2 server, acting as load balancer, is
50% idle, while the other Apache2 server is 0% idle:

--- Apache #1 (includes load balancer to forward connections to Apache
top - 19:35:21 up 26 days,  2:21,  3 users,  load average: 165.76,
163.97, 200.46
Tasks: 829 total, 155 running, 673 sleeping,   1 stopped,   0 zombie
Cpu(s): 36.3%us, 10.2%sy,  0.0%ni, 47.2%id,  5.1%wa,  0.1%hi,  1.0%si,
Mem:   2070172k total,  1978392k used,    91780k free,    48016k
Swap:   998376k total,   244336k used,   754040k free,   518996k

--- Apache #2
top - 19:33:46 up 21 days,  3:23,  3 users,  load average: 511.90,
468.51, 351.50
Tasks: 1325 total, 105 running, 1219 sleeping,   1 stopped,   0 zombie
Cpu(s): 28.5%us, 65.1%sy,  0.0%ni,  0.0%id,  0.0%wa,  1.1%hi,  5.4%si,
Mem:   2061660k total,  2012144k used,    49516k free,     2084k
Swap:   922600k total,   430876k used,   491724k free,   104796k

Any idea to explain this imbalance? Should we get better performance
with a dedicated box?

Thank you.

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