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for better performance, you might consider using hardware crypto
offload to improve throughput. this is known to work to well, and
some crypto acceleration is effective enough that the
compression/decompression is now the bottleneck for a Tor router.
there are a number of such add in cards and even some CPU's with
crypto acceleration built in (VIA padlock).
by the way: in comparison with the standard gcc compiled Debian package
on my dual Intel Xeon box Tor performs about 30% better with the OpenSSL
library compiled with Intel's C compiler icc v10.1. In this context the
term "performance" means the ratio between throughput and cpu load.
Compiling the Tor application with icc doesn't change very much.