higher TCP ICW – real world tests

this post inspired me to check how much performance can we gain by just upgrading to more recent kernel on the internet-facing proxy servers at work.

i’ve run few benchmarks timing repeated HTTP/1.0 downloads with server located in Szczecin – Poland and one client in Hong Kong [ ~350ms ], another client in Stockholm – Sweden [ ~44ms ]. first test was run with proxy server running debian’s stock kernel 2.6.32, second – with 3.2.0 from backports.

benchmark results:

full data – here or here.

all in all this looks promising and gives reasonable speedup that will be useful in our case [downloads of gzipped xmls each ~5-10kB after compression, occurring every few minutes which is rarely enough not to benefit from persistent http connections].

side notes:

installation of backports kernel for debian:

echo http://backports.debian.org/debian-backports squeeze-backports main >> /etc/apt/sources.list
apt-get update
apt-get install -t squeeze-backports linux-image-3.2.0-0.bpo.2-686-pae

methodology: for each size, location and kernel version i’ve run 100 downloads using ab. for each of measurement sessions i’ve rejected 2 slowest downloads.

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