OpenCL Kernel Summary shows negative Device Times for some kernels

When using Nsight Performance Analysis tool and viewing OpenCL Kernel Summary, it shows negative Device Time for some kernels. It’s an intermittent problem and might be because the GPU is being utilised by my code and the graphics device. Any one else seen anything similar and know of a workaround?

Here’s a screenshot.

http://snag.gy/lC7HU.jpg

Hi,

Could you provide your OS version, Nsight version, driver version, GPU config? If possible, get your executable file will help us a lot to repro your problem locally. Thanks.

Qian@nvidia