Re: [tor-dev] performance of CREATE/CREATED handshake

2016-10-13 Thread Yawning Angel 
On Thu, 13 Oct 2016 15:05:05 +0200
Rob van der Hoeven  wrote:
> This is what I was looking for. Running the benchmark on two very
> different systems was revealing: on my Pentium G620 the ntor
> server-side time was ~300 uSec, an Allwinner A20 system completed the
> server-side code in ~10600 uSec.

One of the things on my TODO list is to use NEON for the X25519 scalar
mult on ARM targets that are capable of such since it's a decent
performance increase, at least on 32 bit ARM.

One day I will also get an Aarch64 target and figure out optimization
there, since it's the way of the future.

Regards,

-- 
Yawning Angel


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Re: [tor-dev] performance of CREATE/CREATED handshake

2016-10-13 Thread Rob van der Hoeven 
On Wed, 2016-10-12 at 13:57 +, Yawning Angel wrote:
> On Wed, 12 Oct 2016 13:37:24 +0200
> Rob van der Hoeven  wrote:
> > 2) The average CPU-time it takes to perform a CREATE/CREATED
> > handshake.
> 
> This "depends" entirely on your CPU and which handshake is used, though
> I don't particularly consider TAP handshake performance relevant
> because it is slow and superseded by ntor.
> 
> `src/test/bench` will give concrete numbers (~140 usec on a modern
> Intel processor).

This is what I was looking for. Running the benchmark on two very
different systems was revealing: on my Pentium G620 the ntor server-side
time was ~300 uSec, an Allwinner A20 system completed the server-side
code in ~10600 uSec.

Thanks!
Rob.
https://hoevenstein.nl


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Re: [tor-dev] performance of CREATE/CREATED handshake

2016-10-12 Thread teor 

> On 13 Oct 2016, at 00:57, Yawning Angel  wrote:
> 
> On Wed, 12 Oct 2016 13:37:24 +0200
> Rob van der Hoeven  wrote:
>> 2) The average CPU-time it takes to perform a CREATE/CREATED
>> handshake.
> 
> This "depends" entirely on your CPU and which handshake is used, though
> I don't particularly consider TAP handshake performance relevant
> because it is slow and superseded by ntor.

In 0.2.9 and later, TAP is only used by the receiving party in the hidden
service protocol. (That is, client intro and service rendezvous.)

Also, relays that only have TAP onion keys are ignored by authorities,
other relays, and clients.

T

> 
> `src/test/bench` will give concrete numbers (~140 usec on a modern
> Intel processor).
> 
> Regards,
> 
> --
> Yawning Angel
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T

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Re: [tor-dev] performance of CREATE/CREATED handshake

2016-10-12 Thread Yawning Angel 
On Wed, 12 Oct 2016 13:37:24 +0200
Rob van der Hoeven  wrote:
> 2) The average CPU-time it takes to perform a CREATE/CREATED
> handshake.

This "depends" entirely on your CPU and which handshake is used, though
I don't particularly consider TAP handshake performance relevant
because it is slow and superseded by ntor.

`src/test/bench` will give concrete numbers (~140 usec on a modern
Intel processor).

Regards,

-- 
Yawning Angel


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[tor-dev] performance of CREATE/CREATED handshake

2016-10-12 Thread Rob van der Hoeven 
Hi folks,

I'm currently thinking about a new scalable network architecture for
Tor. In order to get some idea about the performance of this
architecture I need some data about the CREATE/CREATED handshake. This
handshake involves PK encryption which is of course time consuming, and
this probably determines the maximum client-capacity of a node in my new
network architecture. I'm interested in two values:

1) The average circuit-rate of a single client (circuits/sec)
2) The average CPU-time it takes to perform a CREATE/CREATED handshake.

Any data on these questions is much appreciated.

Rob.
https://hoevenstein.nl


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