https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Driver-Crash-with-Hyper-threading-enabled-on-P4/m-p/959643#M5299 <DIV>Our driver crashes(Blue Screen)when we enable HyperThreading on P4 processor with Windows XP. The driver runs without any problem when Hyper-threading is disabled. Also, this crash happens only with Intel D865GLC motherboard with P4 3.0GHz processor with HT enabled (the driver works fine on other motherboards with HT enabled)<BR /><BR />We are using floating point operations in our driver.WinDbgshows floating point exception. The code flow involving FloatingPointUnit is as shown below:<BR /><BR />1) Disable Interrupts (all interrupts except NMI)<BR />2) Save Floating point context<BR />3) Driver processing function (uses floating point operations)<BR />4) Restore Floating point context<BR />5) Enable Interrupts <BR /></DIV> <DIV>The driver runs as a single thread in the kernel mode.</DIV> <DIV>We are unable to get to the root cause of the problem. Any help would be appreciated.</DIV> Mon, 05 Dec 2005 21:26:39 GMT gdravi 2005-12-05T21:26:39Z https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Driver-Crash-with-Hyper-threading-enabled-on-P4/m-p/959643#M5299 <DIV>Our driver crashes(Blue Screen)when we enable HyperThreading on P4 processor with Windows XP. The driver runs without any problem when Hyper-threading is disabled. Also, this crash happens only with Intel D865GLC motherboard with P4 3.0GHz processor with HT enabled (the driver works fine on other motherboards with HT enabled)<BR /><BR />We are using floating point operations in our driver.WinDbgshows floating point exception. The code flow involving FloatingPointUnit is as shown below:<BR /><BR />1) Disable Interrupts (all interrupts except NMI)<BR />2) Save Floating point context<BR />3) Driver processing function (uses floating point operations)<BR />4) Restore Floating point context<BR />5) Enable Interrupts <BR /></DIV> <DIV>The driver runs as a single thread in the kernel mode.</DIV> <DIV>We are unable to get to the root cause of the problem. Any help would be appreciated.</DIV> Mon, 05 Dec 2005 21:26:39 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Driver-Crash-with-Hyper-threading-enabled-on-P4/m-p/959643#M5299 gdravi 2005-12-05T21:26:39Z https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Driver-Crash-with-Hyper-threading-enabled-on-P4/m-p/959644#M5300 <P>Have you tried updating the BIOS? Others in the forum have had good luck doing that to fix their HT problems?</P> <P>--clay</P> <DIV></DIV> Fri, 23 Dec 2005 05:41:15 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Driver-Crash-with-Hyper-threading-enabled-on-P4/m-p/959644#M5300 ClayB 2005-12-23T05:41:15Z