Using hardware breakpoint kills VM performance

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  • October 4, 2013 at 12:49 #652
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    I’m using Debugging Tools 6.12.2.633 from 1.2.2010 (also tried the latest 6.3.9391.6 from 3.5.2013), VirtualKD 2.8.0.1 with Virtual Box 4.1.24 (regsvr32 won’t work for me with any newer version) on Windows 7 x64. When I set any hardware breakpoint using windbg (e.g. ba e1 0), the virtual machine slows down to a crawl. For example in task manager I can see that processes that are supposed to be doing almost nothing take lots of CPU time for long periods, but eventually get things done. This happens every time I try to use a hw breakpoint. I can use software breakpoints without problems, and also hw breakpoints when debugging a real machine. Any ideas would be appreciated.

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