SQL 2008 R2 - Resource monitor high CPU usage

Hello,

I need some advice for resolving high CPU usage for resource monitor on 2008 R2 SP1.
I have searched but only found some bug on 2008 version.

I am not sure if I am reading this correctly - In Perfmon I have found thread that consumes 30-70 % CPU time - that thread is resource monitor. SQL 2008 R2 SP1, One instance limited to 1,9GB RAM. Global CPU moves around 20/30 with spikes to 70%.

Is there way to control resource monitor or am I supposed to increase memory on instance ? It shouldn't need more than that.

Thanks for all advice