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Recording and timeshift ts files saved by System account with backgound priority
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<blockquote data-quote="mm1352000" data-source="post: 1213812" data-attributes="member: 82144"><p>Please allow me to be up-front with you.</p><p></p><p>1. I'm a little doubtful that your problem is caused by I/O contention.</p><p>Packet loss could be caused by other factors like signal strength/quality issues, a badly behaved driver that causes high DPC latency, etc.</p><p></p><p>2. In my opinion it's not practical for us to set the I/O priority.</p><p>Results of a quick Internet search suggest that Microsoft doesn't intend to make it possible for programs to <em>increase</em> their I/O priority. It's possible (via <a href="https://msdn.microsoft.com/en-us/library/ms686219%28VS.85%29.aspx" target="_blank">SetProcessPriorityClass</a> with PROCESS_MODE_BACKGROUND_BEGIN/PROCESS_MODE_BACKGROUND_END) for programs to <em>lower</em> their I/O priority when doing background work (we're definitely not doing this!)... but in all other cases, Windows gets to choose the I/O priority.</p><p><a href="http://superuser.com/questions/136021/how-to-change-i-o-priority-of-a-process-or-thread-in-win7" target="_blank">How to change I/O priority of a process or thread in Win7?</a></p><p><a href="http://geekswithblogs.net/akraus1/archive/2014/06/30/157203.aspx" target="_blank">Fun With Process/Thread and IO Priorities</a></p><p></p><p>The links above do mention an "NTSetInformationProcess" Windows API function which can be used to select any preferred I/O priority value. However, that function is undocumented. That's why I said "Microsoft doesn't intend...". In my opinion it's best that we avoid using undocumented functions.</p><p></p><p>3. I'm a little doubtful that setting the I/O priority would be a reliable solution for an I/O contention problem.</p><p>Increasing the priority doesn't make the contention go away. You'd still be stuck trying to get good performance while multi-tasking with a single, half full (therefore, probably reasonably fragmented) 5400 rpm HDD.</p><p></p><p>If you haven't already done so, my advice would be to try to confirm that the problem is really caused by I/O contention. In other words:</p><ul> <li data-xf-list-type="ul">check signal strength/quality</li> <li data-xf-list-type="ul">check DPC latency</li> <li data-xf-list-type="ul">try to use Process Lasso or similar to increase the I/O priority and check if it makes any difference<br /> </li> <li data-xf-list-type="ul">defragment your HDD and check if that makes any difference<br /> </li> <li data-xf-list-type="ul">if possible, reduce multi-tasking while recording and check if that makes any difference</li> </ul><p>If the problem is caused by I/O contention, probably the best solution may involve upgrading your HDD (eg. get an SSD and/or additional/faster HDD) and/or use of Process Lasso.</p></blockquote><p></p>
[QUOTE="mm1352000, post: 1213812, member: 82144"] Please allow me to be up-front with you. 1. I'm a little doubtful that your problem is caused by I/O contention. Packet loss could be caused by other factors like signal strength/quality issues, a badly behaved driver that causes high DPC latency, etc. 2. In my opinion it's not practical for us to set the I/O priority. Results of a quick Internet search suggest that Microsoft doesn't intend to make it possible for programs to [I]increase[/I] their I/O priority. It's possible (via [URL='https://msdn.microsoft.com/en-us/library/ms686219%28VS.85%29.aspx']SetProcessPriorityClass[/URL] with PROCESS_MODE_BACKGROUND_BEGIN/PROCESS_MODE_BACKGROUND_END) for programs to [I]lower[/I] their I/O priority when doing background work (we're definitely not doing this!)... but in all other cases, Windows gets to choose the I/O priority. [URL="http://superuser.com/questions/136021/how-to-change-i-o-priority-of-a-process-or-thread-in-win7"]How to change I/O priority of a process or thread in Win7?[/URL] [URL="http://geekswithblogs.net/akraus1/archive/2014/06/30/157203.aspx"]Fun With Process/Thread and IO Priorities[/URL] The links above do mention an "NTSetInformationProcess" Windows API function which can be used to select any preferred I/O priority value. However, that function is undocumented. That's why I said "Microsoft doesn't intend...". In my opinion it's best that we avoid using undocumented functions. 3. I'm a little doubtful that setting the I/O priority would be a reliable solution for an I/O contention problem. Increasing the priority doesn't make the contention go away. You'd still be stuck trying to get good performance while multi-tasking with a single, half full (therefore, probably reasonably fragmented) 5400 rpm HDD. If you haven't already done so, my advice would be to try to confirm that the problem is really caused by I/O contention. In other words: [LIST] [*]check signal strength/quality [*]check DPC latency [*]try to use Process Lasso or similar to increase the I/O priority and check if it makes any difference [*]defragment your HDD and check if that makes any difference [*]if possible, reduce multi-tasking while recording and check if that makes any difference [/LIST] If the problem is caused by I/O contention, probably the best solution may involve upgrading your HDD (eg. get an SSD and/or additional/faster HDD) and/or use of Process Lasso. [/QUOTE]
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