stunnel: Performance

Do you really need a hardware SSL accelerator? Check stunnel performance data below.

Data throughput RC4-MD563MB/s530Mbit/s
AES128-SHA65MB/s550Mbit/s
AES256-SHA54MB/s450Mbit/s
DES-CBC3-SHA13MB/s110Mbit/s
New connections without session cache
(2048-bit RSA certificate)
Software325 conn/s
Hardwareestimated*
approx.
1 000 conn/s
with session cache2 400 conn/s
Max. concurrent sessions Unix poll() / Win32over 10 000
Unix select()500
Memory usage150KB/concurrent connection


Performance was tested on:
  • OS: Debian GNU/Linux, kernel version 3.2.0-1-amd64 #1 SMP Sun Feb 5 15:17:15 UTC 2012 x86_64 GNU/Linux
  • CPU: Intel Core2 Duo E6400 (2.13GHz, 1066MHz FSB, 2MB L2 Cache)
  • OpenSSL: 1.0.0g (openssl_1.0.0g-1_amd64.deb)
  • stunnel: 4.53
(*) Needs further testing.

View Michal Trojnara's profile on LinkedIn

OpenSSL

Valid HTML 4.01 Transitional