public:netnotes
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public:netnotes [2014/05/09 22:08] ivan created |
public:netnotes [2014/05/10 00:37] (current) ivan |
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| http://www.anchor.com.au/blog/2009/10/load-balancing-at-github-why-ldirectord/ | http://www.anchor.com.au/blog/2009/10/load-balancing-at-github-why-ldirectord/ | ||
| - | Comment from Willy TARREAU: | + | Comment from Willy TARREAU: \\ |
| Concerning the performance, it depends what you are doing. Direct-routing load balancers installed in one-leg configuration where they only see upstream traffic will always be faster than a proxy because they see about half the packets. Common figures are about 4 times haproxy's max connection rate. A load balancer set up in the middle of the stream will still generally be faster than the proxy on connection rate, but can be slower on high bit rates (multi-gigabit), because it cannot make use of TCP speedups the NIC provides, while a proxy can. For instance, haproxy can forward 10 Gbps of HTTP traffic with only 20% CPU on one of my machines, while this machine has high difficulties to simply IP-forward the same stream at this rate. This is because of the TCP off-loading capabilities of the NICs which can only work with the proxy. But granted, this is not everyone's needs ! | Concerning the performance, it depends what you are doing. Direct-routing load balancers installed in one-leg configuration where they only see upstream traffic will always be faster than a proxy because they see about half the packets. Common figures are about 4 times haproxy's max connection rate. A load balancer set up in the middle of the stream will still generally be faster than the proxy on connection rate, but can be slower on high bit rates (multi-gigabit), because it cannot make use of TCP speedups the NIC provides, while a proxy can. For instance, haproxy can forward 10 Gbps of HTTP traffic with only 20% CPU on one of my machines, while this machine has high difficulties to simply IP-forward the same stream at this rate. This is because of the TCP off-loading capabilities of the NICs which can only work with the proxy. But granted, this is not everyone's needs ! | ||
public/netnotes.txt · Last modified: 2014/05/10 00:37 by ivan
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