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<blockquote data-quote="doveman" data-source="post: 829327" data-attributes="member: 67412"><p>OK, I think I'm getting somewhere.</p><p></p><p>I unplugged all my USB devices and after 37mins the highest latency was around 500us. As soon as I plugged my KVM back in, it jumped to 1060us. I actually have it plugged in the USB 3 ports, which I assume are running as USB 2 because I've disabled both Renesas Electronics USB 3 Host Controllers (which are each under a PCI Standard PCI-to-PCI bridge). There's also a small utility (nusb3mon.exe) that is part of the motherboard drivers that's running, so I'll try killing that and if that doesn't help, plug the KVM into one of the USB 2 ports.</p><p></p><p>I'm a bit confused, as besides the two USB 3 Host controllers, there's three Standard Enhanced PCI to USB Host Controllers and four Standard OpenHCD USB Host Controllers. Each controller supports two ports, so one USB 3 controller would be for the two external ports and the other for the internal port, then two of the PCI to USB and OpenHCD USB controllers would be for the four external USB 2 ports, then there's two internal USB 2 ports which accounts for the third PCI to USB and OpenHCD USB controller, which leaves one OpenHCD USB controller with no associated PCI to USB controller. I can only assume this is for the two eSATA / USB 2.0 Combo ports which don't use a PCI to USB controller. Although there must be a controller assigned to the two USB 3 ports so that they still work (in USB 2 mode) when the two USB 3 Host controllers are disabled, so perhaps that uses the fourth OpenHCD USB controller and the Combo ports run off something completely different (I can't imagine what though).</p><p></p><p>EDIT at 18:04: Well killing nusb3mon.exe seems to have brought the max execution time down for USBPORT.sys from 1.3ms to 0.38ms, but still that's rather high.</p><p></p><p>So I plugged the KVM into a USB2/SATA combo port, which kept it down to about 0.25ms, but within 15 minutes I got a spike highest ISR execution time (not shown on the drivers tab) on ataport.sys, although that may have been a coincidence.</p><p></p><p><a href="http://imageshack.us/photo/my-images/703/latencymonkvminusb2comb.png/" target="_blank"><img src="http://img703.imageshack.us/img703/8237/latencymonkvminusb2comb.th.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p></p><p><a href="http://imageshack.us/photo/my-images/545/latencymonkvminusb2comb.png/" target="_blank"><img src="http://img545.imageshack.us/img545/8237/latencymonkvminusb2comb.th.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>So then I plugged the KVM into a normal USB2 port and after 32mins (43mins now) it hasn't had any problems, although the USBPORT.sys and ataport.sys max times haven't really changed from the 0.2-0.25 they were when in my first post. ndis.sys is now at the top as it's increased from 0.03ms to 0.2ms and lately 0.28ms, which seems to have happened since I disabled the Agnitum/OSS driver (I've now uninstalled OSS, although I don't think I've rebooted since, so I ought to do that).</p><p></p><p><a href="http://imageshack.us/photo/my-images/16/latencymonkvminusb232mi.png/" target="_blank"><img src="http://img16.imageshack.us/img16/5563/latencymonkvminusb232mi.th.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p><a href="http://imageshack.us/photo/my-images/594/latencymonkvminusb232mi.png/" target="_blank"><img src="http://img594.imageshack.us/img594/5563/latencymonkvminusb232mi.th.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="doveman, post: 829327, member: 67412"] OK, I think I'm getting somewhere. I unplugged all my USB devices and after 37mins the highest latency was around 500us. As soon as I plugged my KVM back in, it jumped to 1060us. I actually have it plugged in the USB 3 ports, which I assume are running as USB 2 because I've disabled both Renesas Electronics USB 3 Host Controllers (which are each under a PCI Standard PCI-to-PCI bridge). There's also a small utility (nusb3mon.exe) that is part of the motherboard drivers that's running, so I'll try killing that and if that doesn't help, plug the KVM into one of the USB 2 ports. I'm a bit confused, as besides the two USB 3 Host controllers, there's three Standard Enhanced PCI to USB Host Controllers and four Standard OpenHCD USB Host Controllers. Each controller supports two ports, so one USB 3 controller would be for the two external ports and the other for the internal port, then two of the PCI to USB and OpenHCD USB controllers would be for the four external USB 2 ports, then there's two internal USB 2 ports which accounts for the third PCI to USB and OpenHCD USB controller, which leaves one OpenHCD USB controller with no associated PCI to USB controller. I can only assume this is for the two eSATA / USB 2.0 Combo ports which don't use a PCI to USB controller. Although there must be a controller assigned to the two USB 3 ports so that they still work (in USB 2 mode) when the two USB 3 Host controllers are disabled, so perhaps that uses the fourth OpenHCD USB controller and the Combo ports run off something completely different (I can't imagine what though). EDIT at 18:04: Well killing nusb3mon.exe seems to have brought the max execution time down for USBPORT.sys from 1.3ms to 0.38ms, but still that's rather high. So I plugged the KVM into a USB2/SATA combo port, which kept it down to about 0.25ms, but within 15 minutes I got a spike highest ISR execution time (not shown on the drivers tab) on ataport.sys, although that may have been a coincidence. [URL=http://imageshack.us/photo/my-images/703/latencymonkvminusb2comb.png/][IMG]http://img703.imageshack.us/img703/8237/latencymonkvminusb2comb.th.png[/IMG][/URL] [URL=http://imageshack.us/photo/my-images/545/latencymonkvminusb2comb.png/][IMG]http://img545.imageshack.us/img545/8237/latencymonkvminusb2comb.th.png[/IMG][/URL] So then I plugged the KVM into a normal USB2 port and after 32mins (43mins now) it hasn't had any problems, although the USBPORT.sys and ataport.sys max times haven't really changed from the 0.2-0.25 they were when in my first post. ndis.sys is now at the top as it's increased from 0.03ms to 0.2ms and lately 0.28ms, which seems to have happened since I disabled the Agnitum/OSS driver (I've now uninstalled OSS, although I don't think I've rebooted since, so I ought to do that). [URL=http://imageshack.us/photo/my-images/16/latencymonkvminusb232mi.png/][IMG]http://img16.imageshack.us/img16/5563/latencymonkvminusb232mi.th.png[/IMG][/URL] [URL=http://imageshack.us/photo/my-images/594/latencymonkvminusb232mi.png/][IMG]http://img594.imageshack.us/img594/5563/latencymonkvminusb232mi.th.png[/IMG][/URL] [/QUOTE]
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