id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 6242,VT-x causes massive DPC latency,maqr,,"I am running Windows 7 x64 on a q6600 with virtualization enabled in the bios. Whenever my guest (x64 or x86) is under any kind of load (even just booting the Ubuntu installer), I get big DPC latency spikes. This is obviously a problem because it causes choppy audio, video, and generally degrades performance. Once inside the guest OS, this is can be easily reproduced with a simple bash script: {{{ while true; do """"; done }}} I have reproduced this on an i7 920 with the same problem. Attached is a dpclat screenshot and a dump from xperf. If the ETL would be beneficial in debugging, I could produce one. The ""fix"" for me was to install a 32-bit guest and disable VT-x in the vbox options.",defect,closed,VMM,VirtualBox 3.1.4,fixed,"DPC, VT-x",,Linux,Windows