Not sure if it's relevant at all, but Iong time ago I had a pci-e dtv tuner which requires c-state to be disabled in BIOS (workaround officially suggested by its vendor) to work. On 1 July 2015 at 20:01, Andy Furniss <adf.lists@xxxxxxxxx> wrote: > Andy Furniss wrote: >> >> Andy Furniss wrote: >>> >>> Hi I recently set up a Asrock Q1900DC-itx Intel baytrail board as >>> a router/nas/pvr. It has 2 usb dvb T/T2 tuners attached - pctv 290e >>> and 292e. >>> >>> When running them I am getting lost dvb packets which are detected >>> as lost via dvbs continuity counters. >>> >>> Have tried 3.18.14, and today 4.1.0-rc7 both have the issue. >>> >>> 3.14.43 may not have the issue - but I could only test that with >>> one device due to my 292e not being supported. While testing >>> 3.14.xx I noticed that earlier versions did show the issue (and >>> spinning a cpu fixed it) - bisecting that came up with - >>> >>> usb: xhci: apply XHCI_AVOID_BEI quirk to all Intel xHCI >>> controllers >>> >>> I see this is in 3.18 and current though - the reason I mention it >>> is that the fact I could "fix" 3.14 before that by spinning a cpu >>> eg. - >>> >>> nice -19 dd if=/dev/urandom of=/dev/null >>> >>> leads me to think the current issue is USB related also - hence I >>> am posting here. >>> >>> Analysing mux dumps shows the loss events may be between 1 and 6 >>> 188 byte packets. >>> >>> Where to go from here - anyone have any suggestions? >> >> >> I don't really know much about USB, so if it were any of you that >> had this issue could you tell me where you would start to look/what >> would you try? > > > I manages to mitigate the issue somewhat by disabling usb3 in bios so I > use the ehci driver. > > It's not a total fix though - I still need cpu load to make 80mbit > transfers work reliably (2 x HD channels on different muxes). For lower > bitrate SD muxes I seem to get away with no loss at roughly 50 mbit. > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
