Problem with Transaction rate not increasing on Server size upgrade
Fairly new to Linode and we are in the process of launching a new ruby on rails web server for one of our apps.
It's running Nginx 1.8.0 and passenger 5.
After running siege commands to benchmark the app we're receiving a Transaction rate: of 4.40 trans/sec. This is on a 8gb linode, and is the same as what we were receiving on the 2gb one before we upgraded.
After each upgrade we have run PGtune on postgres, changed the workerprocesses and connections settings in nginx, as well as tweaked the passenger passengermaxpoolsize but still it remains the same.
What are we doing wrong?