Session went Killed / Rollback state in sql server

Hi ,

I have sql server 2008 on my infra.

There one backup job was running more than a day, so i killed the session and it went to killed/rollback state.

And it was consuming more resources in terms of CPU and Disk I/O. I have restarted the sql server service to free the resources.

I just want to know,

Is there any way to clear the session without restarting the sql services ?

Or Is there any way to free the resources on the server or terminate the session ?

Regards,

Vinodh Selvaraj