On Tue, 7 Jun 2016, Michał Pecio wrote: > > That's clear enough. > > > > ISO IN 1007 bytes -> 793 us > > INT IN 32 bytes -> 35 us > > ------ > > 825 us > > > > The additional requirements are: > > > > ISO IN 48 bytes -> 45 us -> 870 us total > > ISO IN 192 bytes -> 158 us -> 983 us total > > Or how about both, 1028 out of 1000 us total ;) > > T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 8 Spd=12 MxCh= 0 > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > P: Vendor=1130 ProdID=f211 Rev= 2.04 > S: Product=USB AUDIO > C:* #Ifs= 5 Cfg#= 1 Atr=80 MxPwr=500mA > I:* If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio > I: If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio > I:* If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio > E: Ad=01(O) Atr=09(Isoc) MxPS= 192 Ivl=1ms > I: If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio > I:* If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio > E: Ad=83(I) Atr=09(Isoc) MxPS= 48 Ivl=1ms > I:* If#= 3 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid > E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=10ms > I:* If#= 4 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid > E: Ad=84(I) Atr=03(Int.) MxPS= 8 Ivl=10ms > > T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=02 Dev#= 7 Spd=12 MxCh= 0 > D: Ver= 1.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > P: Vendor=1110 ProdID=9031 Rev=20.0b > S: Product=ADSL-USB Modem > S: SerialNumber=00604C8D86AA > C:* #Ifs= 3 Cfg#= 1 Atr=80 MxPwr=400mA > I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=07 Prot=00 Driver=ueagle-atm > E: Ad=84(I) Atr=03(Int.) MxPS= 32 Ivl=1ms > I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms > E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms > I: If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms > E: Ad=02(O) Atr=03(Int.) MxPS= 64 Ivl=1ms > I: If#= 2 Alt= 0 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms > I: If#= 2 Alt= 1 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 159 Ivl=1ms > I: If#= 2 Alt= 2 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 265 Ivl=1ms > I: If#= 2 Alt= 3 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 424 Ivl=1ms > I: If#= 2 Alt= 4 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 530 Ivl=1ms > I: If#= 2 Alt= 5 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 636 Ivl=1ms > I: If#= 2 Alt= 6 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 795 Ivl=1ms > I: If#= 2 Alt= 7 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS= 901 Ivl=1ms > I:* If#= 2 Alt= 8 #EPs= 1 Cls=0a(data ) Sub=00 Prot=00 Driver=ueagle-atm > E: Ad=88(I) Atr=01(Isoc) MxPS=1007 Ivl=1ms > > T: Bus=01 Lev=01 Prnt=01 Port=04 Cnt=03 Dev#= 2 Spd=1.5 MxCh= 0 > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > P: Vendor=0461 ProdID=4ebc Rev= 1.04 > S: Manufacturer=NOVATEK > S: Product=Classic USB Keyboard > C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA > I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid > E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms > I:* If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid > E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=10ms > > size = 32 > 0 [354]: ed8/ffff8800df655050 (ls dev2 ep1in-int qlen 1 max 8 00083082) ed1/ffff8800df655140 (fs dev7 ep4in-int qlen 1 max 32 00201207) ed1/ffff8800df6551e0 (fs dev7 ep8in-iso qlen 12 max 1007 03ef9407) ed1/ffff8800df655370 (fs dev8 ep1out-iso qlen 13 max 192 00c08888) ed1/ffff8800df6553c0 (fs dev8 ep3in-iso qlen 12 max 48 00309188) > 1 [354]: ed8/ffff8800df6550a0 (ls dev2 ep2in-int qlen 1 max 8 00083102) ed1/ffff8800df655140 > 2 [253]: ed8/ffff8800df655280 (fs dev8 ep2in-int qlen 1 max 8 00081108) ed1/ffff8800df655140 > 3 [253]: ed8/ffff8800df655230 (fs dev8 ep4in-int qlen 1 max 8 00081208) ed1/ffff8800df655140 > 4 [237]: ed1/ffff8800df655140 > 5 [237]: ed1/ffff8800df655140 > 6 [237]: ed1/ffff8800df655140 > 7 [237]: ed1/ffff8800df655140 > 8 [354]: ed8/ffff8800df655050 > 9 [354]: ed8/ffff8800df6550a0 > 10 [253]: ed8/ffff8800df655280 > 11 [253]: ed8/ffff8800df655230 > 12 [237]: ed1/ffff8800df655140 > 13 [237]: ed1/ffff8800df655140 > 14 [237]: ed1/ffff8800df655140 > 15 [237]: ed1/ffff8800df655140 > 16 [354]: ed8/ffff8800df655050 > 17 [354]: ed8/ffff8800df6550a0 > 18 [253]: ed8/ffff8800df655280 > 19 [253]: ed8/ffff8800df655230 > 20 [237]: ed1/ffff8800df655140 > 21 [237]: ed1/ffff8800df655140 > 22 [237]: ed1/ffff8800df655140 > 23 [237]: ed1/ffff8800df655140 > 24 [354]: ed8/ffff8800df655050 > 25 [354]: ed8/ffff8800df6550a0 > 26 [253]: ed8/ffff8800df655280 > 27 [253]: ed8/ffff8800df655230 > 28 [237]: ed1/ffff8800df655140 > 29 [237]: ed1/ffff8800df655140 > 30 [237]: ed1/ffff8800df655140 > 31 [237]: ed1/ffff8800df655140 Clearly a bug, and almost certainly the bug that we just identified. > Audio playback and keyboard work perfectly, audio recording produces > *some* output (didn't check what) and the network seems good enough to > fetch small website with curl every second, although I feel like pppd > takes unusually long to start. Periodic scheduling is "pessimistic"; it uses worst-case values. So if the driver over-commits, things will still work okay most of the time. > This is 3.14.25 and I'm almost sure *every* current kernel allows that. No doubt. > I'm almost sure your fix eleminates this issue as well, so I wonder if > maybe it shouldn't be sent to all LTS releases, if somebody can confirm > that this looks like a real problem and not just me being clueless ;) Yes, it is a real problem. On the other hand, I'm concerned about fixing it, because (as you saw) it will cause things that work pretty well to stop working. Alan Stern -- 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
