Does anyone in here happens to be running openbsd 6.3 in some machine which has a N7260 wifi card? I have problems with mine (thinkpad x240), and since it only happens on openbsd as far as I can tell, I was wondering if it is some kind of driver problem. I tested ubuntu 16.04, which uses version 17 of the intel firmware, and the problem doesn't happen. Openbsd is using version 16 of intel firmware.
The problem is that whenever I am downloading or uploading any file bigger than a couple of megabytes, performance will degrade during the transmission and speed will drop to a halt, often timing out. Doing some research on the web, I was able to find users of other OS'es complaining about a similar problem with N7260, but the reports I found were a couple of years old, which made me think that it was possibly a bug in the intel firmware which they probably fixed since then. It does not seem to be related to my wifi router nor service provider, since the same happens with another router and provider. It also happens not only in http transfers, but also in ssh. I didn't try to run -current because I didn't saw any change in iwm. Thanks in advance for any help. Below is my dmesg output: OpenBSD 6.3 (GENERIC.MP) #1: Sat Apr 21 14:26:25 CEST 2018 r...@syspatch-63-amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 3951247360 (3768MB) avail mem = 3824422912 (3647MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xdcd3d000 (60 entries) bios0: vendor LENOVO version "GIET92WW (2.42 )" date 02/28/2018 bios0: LENOVO 20AMS0MT00 acpi0 at bios0: rev 2 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP SLIC DBGP ECDT HPET APIC MCFG SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT PCCT SSDT UEFI MSDM ASF! BATB FPDT UEFI acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP2(S4) XHCI(S3) EHC1(S3) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpiec0 at acpi0 acpihpet0 at acpi0: 14318179 Hz acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1796.15 MHz cpu0: FPU,VME,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,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu0: 256KB 64b/line 8-way L2 cache acpihpet0: recalibrated TSC frequency 2494228431 Hz cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges cpu0: apic clock running at 99MHz cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.84 MHz cpu1: FPU,VME,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,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu1: 256KB 64b/line 8-way L2 cache cpu1: smt 1, core 0, package 0 cpu2 at mainbus0: apid 2 (application processor) cpu2: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.84 MHz cpu2: FPU,VME,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,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu2: 256KB 64b/line 8-way L2 cache cpu2: smt 0, core 1, package 0 cpu3 at mainbus0: apid 3 (application processor) cpu3: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz, 1795.84 MHz cpu3: FPU,VME,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,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu3: 256KB 64b/line 8-way L2 cache cpu3: smt 1, core 1, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (PEG_) acpiprt2 at acpi0: bus 2 (EXP1) acpiprt3 at acpi0: bus 3 (EXP2) acpiprt4 at acpi0: bus -1 (EXP3) acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS acpipwrres0 at acpi0: PUBS, resource for XHCI, EHC1 acpitz0 at acpi0: critical temperature is 200 degC acpibtn0 at acpi0: LID_ acpibtn1 at acpi0: SLPB "LEN0071" at acpi0 not configured "LEN0035" at acpi0 not configured acpibat0 at acpi0: BAT0 model "45N1773" serial 15960 type LION oem "SANYO" acpibat1 at acpi0: BAT1 model "45N1735" serial 2379 type LION oem "LGC" acpiac0 at acpi0: AC unit online acpithinkpad0 at acpi0 "PNP0C14" at acpi0 not configured "PNP0C14" at acpi0 not configured "PNP0C14" at acpi0 not configured "INT340F" at acpi0 not configured acpivideo0 at acpi0: VID_ acpivout at acpivideo0 not configured acpivideo1 at acpi0: VID_ cpu0: Enhanced SpeedStep 1796 MHz: speeds: 2501, 2500, 2400, 2200, 2100, 1900, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 800, 775 MHz pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x0b inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x0b drm0 at inteldrm0 inteldrm0: msi inteldrm0: 1366x768, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x0b: msi xhci0 at pci0 dev 20 function 0 "Intel 8 Series xHCI" rev 0x04: msi usb0 at xhci0: USB revision 3.0 uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 "Intel 8 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured em0 at pci0 dev 25 function 0 "Intel I218-LM" rev 0x04: msi, address 68:f7:28:0c:c2:9b azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi azalia1: codecs: Realtek ALC292 audio0 at azalia1 ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4: msi pci1 at ppb0 bus 2 rtsx0 at pci1 dev 0 function 0 "Realtek RTS5227 Card Reader" rev 0x01: msi sdmmc0 at rtsx0: 4-bit, dma ppb1 at pci0 dev 28 function 1 "Intel 8 Series PCIE" rev 0xe4: msi pci2 at ppb1 bus 3 iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7260" rev 0x83, msi ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 2 int 23 usb1 at ehci0: USB revision 2.0 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04 ahci0 at pci0 dev 31 function 2 "Intel 8 Series AHCI" rev 0x04: msi, AHCI 1.3 ahci0: port 0: 6.0Gb/s scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, KINGSTON SA400S3, SBFK> SCSI3 0/direct fixed naa.5000000000000000 sd0: 114473MB, 512 bytes/sector, 234441648 sectors, thin ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic 2 int 18 iic0 at ichiic0 spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-12800 SO-DIMM isa0 at pcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 wsmouse1 at pms0 mux 0 pms0: Synaptics clickpad, firmware 8.1, 0x1e2b1 0x940300 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 error: [drm:pid0:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe A error: [drm:pid0:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets root on sd0a (9c48fa00b297974f.a) swap on sd0b dump on sd0b iwm0: hw rev 0x140, fw ver 16.242414.0, address e8:b1:fc:9e:29:5b uhub0 detached uhub2 detached uhub1 detached uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 uhub0 detached uhub2 detached uhub1 detached uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 uhub0 detached uhub2 detached uhub1 detached uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 uhub0 detached uhub2 detached uhub1 detached uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 uhub0 detached uhub2 detached uhub1 detached uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 uhub0 detached uhub2 detached uhub1 detached uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2