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I was interested in seeing if the linux/ipchains workaround for the
arp problem would perform just as well as the arp_invisible kernel
patch. It is apparently much worse.
I ran a test with one client running ab ("apache benchmark"), one
director, and one realserver running Apache. They are all various
levels of pentium desktop machines running 2.2.13.
Using the arp_invisible patch/dummy0 interface, I get 226 HTTP
requests/second. Using the ipchains redirect method, I get 70
requests per second. All other things remained the same during the
test.
I found this pretty interesting, I was initially attracted to ipchains
method because it is so simple to config (well maybe 2 shell commands
vs. 4 or 5 :-), and doesn't even require a kernel patch. Based on
this test, though, I wouldn't recommend using ipchains redirect for a
high traffic web site.
Cheers,
Doug
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