I have a USB 802.11n capable dongle that works fine in a netbook[3] but not in a server[2], which is where it was intended. The sypmtom is a cessation of packet traffic followed by device timeout as described in urtwn(4). A similar problem was mentioned last year[1] on misc@, though the specific Realtek chipset involved was not posted.
I built a kernel with USB_DEBUG which enables URTWN_DEBUG, and while running with that test kernel I could not replicate the problem. From that test, I understand that timing or a race condition are likely areas of research. It aligns also with the slower system [3] not being able to replicate either. I could use some help as I am unsure how to investigate further. I tried doubling the sc_tx_timer in if_urtwn.c from 5 to 10, with no effect, but that was just a stab in the dark. Any suggestions for futher tests, or a whack with a cluestick would be welcome. Thanks! -Josh Grosse- [1] http://marc.info/?t=134666801100001&r=1&w=2 [2] System that displays the timeout problem: OpenBSD 5.4-current (GENERIC.MP) #82: Tue Oct 15 01:02:02 MDT 2013 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP cpu0: Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz ("GenuineIntel" 686-class) 1.60 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,LONG,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,LAHF,PERF real mem = 1072951296 (1023MB) avail mem = 1043644416 (995MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 02/26/08, BIOS32 rev. 0 @ 0xf0010, SMBIOS rev. 2.4 @ 0xfb450 (24 entries) bios0: vendor American Megatrends Inc. version "P1.90" date 02/26/2008 acpi0 at bios0: rev 0 acpi0: sleep states S0 S1 S4 S5 acpi0: tables DSDT FACP APIC MCFG OEMB acpi0: wakeup devices PCI0(S4) USB1(S4) USB2(S4) USB3(S4) USB4(S4) EHCI(S4) PS2K(S4) PS2M(S4) UAR1(S4) SLAN(S4) P0PA(S4) SLPB(S4) HDAC(S5) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 266MHz cpu0: mwait min=64, max=64, C-substates=0.2.2.2.2, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz ("GenuineIntel" 686-class) 2.53 GHz cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,LONG,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,LAHF,PERF ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 3, 24 pins ioapic1 at mainbus0: apid 3 pa 0xfecc0000, version 3, 24 pins acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (P0P9) acpiprt2 at acpi0: bus 3 (P0PA) acpiprt3 at acpi0: bus 2 (NBPG) acpiprt4 at acpi0: bus 128 (PCI1) acpicpu0 at acpi0 acpicpu1 at acpi0 acpibtn0 at acpi0: SLPB acpibtn1 at acpi0: PWRB bios0: ROM list: 0xc0000/0xec00 cpu0: Enhanced SpeedStep disabled by BIOS pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "VIA PT894 Host" rev 0x00 viaagp0 at pchb0: v3 agp0 at viaagp0: aperture at 0xf8000000, size 0xf000000 pchb1 at pci0 dev 0 function 1 "VIA PT894 Host" rev 0x00 pchb2 at pci0 dev 0 function 2 "VIA PT894 Host" rev 0x00 pchb3 at pci0 dev 0 function 3 "VIA PT890 Host" rev 0x00 pchb4 at pci0 dev 0 function 4 "VIA PT894 Host" rev 0x00 "VIA PT894 IOAPIC" rev 0x00 at pci0 dev 0 function 5 not configured pchb5 at pci0 dev 0 function 7 "VIA PT894 Host" rev 0x00 ppb0 at pci0 dev 1 function 0 "VIA VT8377 AGP" rev 0x00 pci1 at ppb0 bus 1 vga1 at pci1 dev 0 function 0 "NVIDIA GeForce 7600 GT" rev 0xa2 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) ppb1 at pci0 dev 2 function 0 vendor "VIA", unknown product 0xa208 rev 0x00: apic 3 int 3 pci2 at ppb1 bus 2 pciide0 at pci0 dev 15 function 0 "VIA VT8237S SATA" rev 0x00: DMA pciide0: using apic 2 int 21 for native-PCI interrupt pciide1 at pci0 dev 15 function 1 "VIA VT82C571 IDE" rev 0x07: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility wd0 at pciide1 channel 0 drive 0: <ST380011A> wd0: 16-sector PIO, LBA48, 76319MB, 156301488 sectors wd1 at pciide1 channel 0 drive 1: <ST3750640A> wd1: 16-sector PIO, LBA48, 715404MB, 1465149168 sectors wd0(pciide1:0:0): using PIO mode 4, DMA mode 2 wd1(pciide1:0:1): using PIO mode 4, DMA mode 2 wd2 at pciide1 channel 1 drive 0: <ExcelStor Technology J880> wd2: 16-sector PIO, LBA48, 78533MB, 160836480 sectors wd3 at pciide1 channel 1 drive 1: <QUANTUM FIREBALLlct20 40> wd3: 8-sector PIO, LBA, 38172MB, 78177792 sectors wd2(pciide1:1:0): using PIO mode 4, DMA mode 2 wd3(pciide1:1:1): using PIO mode 4, DMA mode 2 uhci0 at pci0 dev 16 function 0 "VIA VT83C572 USB" rev 0xb0: apic 2 int 20 uhci1 at pci0 dev 16 function 1 "VIA VT83C572 USB" rev 0xb0: apic 2 int 22 uhci2 at pci0 dev 16 function 2 "VIA VT83C572 USB" rev 0xb0: apic 2 int 21 uhci3 at pci0 dev 16 function 3 "VIA VT83C572 USB" rev 0xb0: apic 2 int 23 ehci0 at pci0 dev 16 function 4 "VIA VT6202 USB" rev 0x90: apic 2 int 21 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "VIA EHCI root hub" rev 2.00/1.00 addr 1 viapm0 at pci0 dev 17 function 0 "VIA VT8237S ISA" rev 0x00: SMI iic0 at viapm0 spdmem0 at iic0 addr 0x50: 512MB DDR2 SDRAM non-parity PC2-5300CL5 spdmem1 at iic0 addr 0x52: 512MB DDR2 SDRAM non-parity PC2-5300CL5 pchb6 at pci0 dev 17 function 7 "VIA VT8251 VLINK" rev 0x00 vr0 at pci0 dev 18 function 0 "VIA RhineII-2" rev 0x7c: apic 2 int 23, address 00:19:66:70:d9:d2 ukphy0 at vr0 phy 1: Generic IEEE 802.3u media interface, rev. 10: OUI 0x004063, model 0x0032 pchb7 at pci0 dev 19 function 0 "VIA VT8237A" rev 0x00 ppb2 at pci0 dev 19 function 1 "VIA VT8237A" rev 0x00 pci3 at ppb2 bus 3 rl0 at pci3 dev 4 function 0 "Accton MPX 5030/5038" rev 0x10: apic 2 int 17, address 00:10:b5:89:f8:ba rlphy0 at rl0 phy 0: RTL internal PHY dc0 at pci3 dev 5 function 0 "Lite-On PNIC-II" rev 0x25: apic 2 int 18, address 00:a0:cc:e3:42:d6 dcphy0 at dc0 phy 31: internal PHY usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "VIA UHCI root hub" rev 1.00/1.00 addr 1 pci4 at mainbus0 bus 128 azalia0 at pci4 dev 1 function 0 "VIA HD Audio" rev 0x10: apic 2 int 17 azalia0: codecs: Realtek ALC662 audio0 at azalia0 isa0 at mainbus0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 wbsio0 at isa0 port 0x2e/2: W83697HF rev 0x12 lm1 at wbsio0 port 0x290/8: W83697HF npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges umass0 at uhub0 port 1 configuration 1 interface 0 "SanDisk Cruzer Switch" rev 2.00/1.26 addr 2 umass0: using SCSI over Bulk-Only scsibus0 at umass0: 2 targets, initiator 0 sd0 at scsibus0 targ 1 lun 0: <SanDisk, Cruzer Switch, 1.26> SCSI3 0/direct removable serial.07815572030C74414F47 sd0: 3819MB, 512 bytes/sector, 7821312 sectors urtwn0 at uhub0 port 2 "Realtek 802.11n WLAN Adapter" rev 2.00/2.00 addr 3 urtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R, address e8:4e:06:11:3e:34 vscsi0 at root scsibus1 at vscsi0: 256 targets softraid0 at root scsibus2 at softraid0: 256 targets sd1 at scsibus2 targ 1 lun 0: <OPENBSD, SR RAID 1, 005> SCSI2 0/direct fixed sd1: 76316MB, 512 bytes/sector, 156295794 sectors softraid0: volume sd1 is roaming, it used to be sd0, updating metadata root on sd1a (e0835866b9a0c17e.a) swap on sd1b dump on sd1b [3] A much slower system where the device works fine: OpenBSD 5.4-current (GENERIC.MP) #75: Fri Oct 11 15:14:17 MDT 2013 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP cpu0: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE,LAHF,PERF real mem = 1064497152 (1015MB) avail mem = 1035350016 (987MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 04/18/11, BIOS32 rev. 0 @ 0xf0010, SMBIOS rev. 2.5 @ 0xf0720 (30 entries) bios0: vendor American Megatrends Inc. version "1601" date 04/18/2011 bios0: ASUSTeK Computer INC. 1005HA acpi0 at bios0: rev 0 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP APIC MCFG OEMB HPET SSDT acpi0: wakeup devices P0P2(S4) P0P1(S4) HDAC(S4) P0P4(S4) P0P8(S4) P0P5(S4) P0P7(S4) P0P9(S4) P0P6(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 133MHz cpu0: mwait min=64, max=64, C-substates=0.2.2.0.2, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE,LAHF,PERF ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins ioapic0: misconfigured as apic 0, remapped to apid 2 acpimcfg0 at acpi0 addr 0xe0000000, bus 0-63 acpihpet0 at acpi0: 14318179 Hz acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 2 (P0P5) acpiprt2 at acpi0: bus 1 (P0P7) acpiprt3 at acpi0: bus -1 (P0P6) acpiec0 at acpi0 acpicpu0 at acpi0: C3, C2, C1, PSS acpicpu1 at acpi0: C3, C2, C1, PSS acpitz0 at acpi0: critical temperature is 88 degC acpibat0 at acpi0: BAT0 model "1005HA" serial type LION oem "ASUS" acpiac0 at acpi0: AC unit offline acpiasus0 at acpi0 acpibtn0 at acpi0: LID_ acpibtn1 at acpi0: SLPB acpibtn2 at acpi0: PWRB bios0: ROM list: 0xc0000/0xec00! cpu0: Enhanced SpeedStep 1600 MHz: speeds: 1600, 1333, 1067, 800 MHz pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel 82945GME Host" rev 0x03 vga1 at pci0 dev 2 function 0 "Intel 82945GME Video" rev 0x03 intagp0 at vga1 agp0 at intagp0: aperture at 0xd0000000, size 0x10000000 inteldrm0 at vga1 drm0 at inteldrm0 inteldrm0: 1024x600 wsdisplay0 at vga1 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) "Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: msi azalia0: codecs: Realtek ALC269 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 2 int 16 pci1 at ppb0 bus 4 ppb1 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x02: apic 2 int 17 pci2 at ppb1 bus 2 athn0 at pci2 dev 0 function 0 "Atheros AR9285" rev 0x01: apic 2 int 17 athn0: AR9285 rev 2 (1T1R), ROM rev 13, address 00:25:d3:8a:f6:b4 ppb2 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x02: apic 2 int 19 pci3 at ppb2 bus 1 alc0 at pci3 dev 0 function 0 "Attansic Technology L2C" rev 0xc0: msi, address 90:e6:ba:37:cf:5e atphy0 at alc0 phy 0: F1 10/100/1000 PHY, rev. 11 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 2 int 23 uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 2 int 19 uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 2 int 18 uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 2 int 16 ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 2 int 23 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb3 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2 pci4 at ppb3 bus 5 ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02: PM disabled ahci0 at pci0 dev 31 function 2 "Intel 82801GBM AHCI" rev 0x02: msi, AHCI 1.1 scsibus0 at ahci0: 32 targets sd0 at scsibus0 targ 0 lun 0: <ATA, ST9160314AS, 0002> SCSI3 0/direct fixed naa.5000c50019076592 sd0: 152627MB, 512 bytes/sector, 312581808 sectors usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at ichpcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot) pckbc0: using irq 12 for aux slot wsmouse0 at pms0 mux 0 pms0: Synaptics touchpad, firmware 7.2 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges uvideo0 at uhub0 port 2 configuration 1 interface 0 "GenesysLogic Technology Co. III, Ltd. USB2.0 UVC 1.3M WebCam" rev 2.00/16.01 addr 2 video0 at uvideo0 vscsi0 at root scsibus1 at vscsi0: 256 targets softraid0 at root scsibus2 at softraid0: 256 targets root on sd0a (48b9941ca32383be.a) swap on sd0b dump on sd0b
