how can I disable "cache: [GET /] miss" logs?

When I deployed my rails 3.2.1 app in production mode, I saw a lot of log entries like:

cache: [GET /] miss

cache: [GET //] miss

I would like to disable logging these entries.

My config/environments/production.rb did not have config.log_level specified. So it should be :info by default. I tried config.log_level = :error, but it still spit out those log entries. How can I disable them, while keeping other logs for errors and fatals?

Thanks for your help.