[tor-relays] high cpu usage, normal ?

[Steve Snyder]

Configured for 150KB/300KB bandwidth I see 1.5% CPU utilization on my 
machine.  This is on a 1.8GHz Pentium-M (circa 2004) CPU.

This is running on a RHEL 5.5 system.  The version of OpenSSL is so old 
in this distribution that I doubled my encryption throughput by 
statically linking Tor with the current OpenSSL release.

I build the current versions of Tor + libevent + OpenSSL as a monolithic 
application, for profiled execution (GCC v4.4.4).  Run the build for 
several hours, then rebuild using the generated profile data.  The CPU 
bottleneck is clearly the crypto stuff, which is written in x86 ASM and 
so won't benefit from the profiled build.  Still, the peripheral 
functions are improved slightly by the profiling.

The major improvement, though, was from moving to the current OpenSSL.


On 04/05/2011 08:56 AM, Gijs Peskens wrote:
> I'm running an exit relay configured to give up to 6,4MB/s on an
> Athlon64 3000+ Freebsd box, and I'm seeing cpu usage between 30-60% is
> this considered normal ? Any means of getting it down? (except getting a
> faster cpu or hardware crypto)
>
>
>
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