On one of my machines equipped with two msk(4) gigabit ethernet devices,
the reintroduction (rev. 1.32) of counting backpressure in ifiq_input() in
sys/net/ifq.c causes drops when more than 8 ethernet frames arrive in a short
amount of time. I noticed this because this machine is an NFS server, mounted
with the (client-side) option "-w 32768", but the drops are reproducible
(visible with netstat -I msk*) simply by sending to the machine a large (e.g.
17kB) UDP packet which gets fragmented into >8 IP packets.
Increasing net.link.ifrxq.pressure_drop (e.g. from the default value 8 to 40)
suppresses this problem, although I am not sure whether this is the correct
solution.
OpenBSD 6.5-current (GENERIC.MP) #21: Fri Jul 26 13:25:41 CEST 2019
[email protected]:/sys/arch/amd64/compile/GENERIC.MP
real mem = 4269277184 (4071MB)
avail mem = 4129763328 (3938MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.5 @ 0xf0700 (81 entries)
bios0: vendor American Megatrends Inc. version "0404" date 01/28/2010
bios0: ASUSTeK Computer INC. P6TD DELUXE
acpi0 at bios0: ACPI 3.0
acpi0: sleep states S0 S1 S3 S4 S5
acpi0: tables DSDT FACP APIC MCFG OEMB HPET OSFR SSDT
acpi0: wakeup devices NPE2(S4) NPE4(S4) NPE5(S4) NPE6(S4) NPE8(S4) NPE9(S4)
NPEA(S4) P0P1(S4) USB0(S4) USB1(S4) USB2(S4) USB5(S4) EUSB(S4) USB3(S4)
USB4(S4) USB6(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 3207.67 MHz, 06-1a-04
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 133MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2674.42 MHz, 06-1a-04
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2672.74 MHz, 06-1a-04
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 2, package 0
cpu3 at mainbus0: apid 6 (application processor)
cpu3: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2672.74 MHz, 06-1a-04
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 0, core 3, package 0
cpu4 at mainbus0: apid 1 (application processor)
cpu4: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2672.73 MHz, 06-1a-04
cpu4:
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu4: 256KB 64b/line 8-way L2 cache
cpu4: smt 1, core 0, package 0
cpu5 at mainbus0: apid 3 (application processor)
cpu5: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2672.73 MHz, 06-1a-04
cpu5:
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu5: 256KB 64b/line 8-way L2 cache
cpu5: smt 1, core 1, package 0
cpu6 at mainbus0: apid 5 (application processor)
cpu6: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2672.73 MHz, 06-1a-04
cpu6:
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu6: 256KB 64b/line 8-way L2 cache
cpu6: smt 1, core 2, package 0
cpu7 at mainbus0: apid 7 (application processor)
cpu7: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2672.73 MHz, 06-1a-04
cpu7:
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,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,SENSOR,MELTDOWN
cpu7: 256KB 64b/line 8-way L2 cache
cpu7: smt 1, core 3, package 0
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
ioapic1 at mainbus0: apid 9 pa 0xfec8a000, version 20, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xe0000000, bus 0-255
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (NPE2)
acpiprt2 at acpi0: bus -1 (NPE4)
acpiprt3 at acpi0: bus -1 (NPE5)
acpiprt4 at acpi0: bus -1 (NPE6)
acpiprt5 at acpi0: bus -1 (NPE8)
acpiprt6 at acpi0: bus -1 (NPE9)
acpiprt7 at acpi0: bus -1 (NPEA)
acpiprt8 at acpi0: bus 8 (P0P1)
acpiprt9 at acpi0: bus 7 (P0P4)
acpiprt10 at acpi0: bus -1 (P0P5)
acpiprt11 at acpi0: bus 6 (P0P6)
acpiprt12 at acpi0: bus -1 (P0P7)
acpiprt13 at acpi0: bus 5 (P0P8)
acpiprt14 at acpi0: bus 4 (P0P9)
acpiprt15 at acpi0: bus 1 (NPE1)
acpiprt16 at acpi0: bus 2 (NPE3)
acpiprt17 at acpi0: bus 3 (NPE7)
acpicpu0 at acpi0: C1(@1 halt!), PSS
acpicpu1 at acpi0: C1(@1 halt!), PSS
acpicpu2 at acpi0: C1(@1 halt!), PSS
acpicpu3 at acpi0: C1(@1 halt!), PSS
acpicpu4 at acpi0: C1(@1 halt!), PSS
acpicpu5 at acpi0: C1(@1 halt!), PSS
acpicpu6 at acpi0: C1(@1 halt!), PSS
acpicpu7 at acpi0: C1(@1 halt!), PSS
acpipci0 at acpi0 PCI0: _OSC failed
acpicmos0 at acpi0
aibs0 at acpi0 RTMP RVLT RFAN GGRP GITM SITM
"pnp0c14" at acpi0 not configured
acpibtn0 at acpi0: PWRB
cpu0: using IvyBridge MDS workaround
cpu0: Enhanced SpeedStep 3207 MHz: speeds: 2668, 2667, 2533, 2400, 2267, 2133,
2000, 1867, 1733, 1600 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel X58 Host" rev 0x13
ppb0 at pci0 dev 1 function 0 "Intel X58 PCIE" rev 0x13: msi
pci1 at ppb0 bus 1
ppb1 at pci0 dev 3 function 0 "Intel X58 PCIE" rev 0x13: msi
pci2 at ppb1 bus 2
radeondrm0 at pci2 dev 0 function 0 "ATI Radeon HD 5670" rev 0x00
drm0 at radeondrm0
radeondrm0: msi
azalia0 at pci2 dev 0 function 1 "ATI Radeon HD 5600 Audio" rev 0x00: msi
azalia0: no supported codecs
ppb2 at pci0 dev 7 function 0 "Intel X58 PCIE" rev 0x13: msi
pci3 at ppb2 bus 3
"Intel X58 Misc" rev 0x13 at pci0 dev 20 function 0 not configured
"Intel X58 GPIO" rev 0x13 at pci0 dev 20 function 1 not configured
"Intel X58 RAS" rev 0x13 at pci0 dev 20 function 2 not configured
"Intel X58 Throttle" rev 0x13 at pci0 dev 20 function 3 not configured
uhci0 at pci0 dev 26 function 0 "Intel 82801JI USB" rev 0x00: apic 8 int 16
uhci1 at pci0 dev 26 function 1 "Intel 82801JI USB" rev 0x00: apic 8 int 21
uhci2 at pci0 dev 26 function 2 "Intel 82801JI USB" rev 0x00: apic 8 int 19
ehci0 at pci0 dev 26 function 7 "Intel 82801JI USB" rev 0x00: apic 8 int 18
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00
addr 1
azalia1 at pci0 dev 27 function 0 "Intel 82801JI HD Audio" rev 0x00: msi
azalia1: codecs: Analog Devices AD1989B
audio0 at azalia1
ppb3 at pci0 dev 28 function 0 "Intel 82801JI PCIE" rev 0x00: msi
pci4 at ppb3 bus 7
ppb4 at pci0 dev 28 function 2 "Intel 82801JI PCIE" rev 0x00: msi
pci5 at ppb4 bus 6
mskc0 at pci5 dev 0 function 0 "Marvell Yukon 88E8056" rev 0x12, Yukon-2 EC
Ultra rev. B0 (0x3): msi
msk0 at mskc0 port A: address 00:26:18:9f:4b:a4
eephy0 at msk0 phy 0: 88E1149 Gigabit PHY, rev. 1
ppb5 at pci0 dev 28 function 4 "Intel 82801JI PCIE" rev 0x00: msi
pci6 at ppb5 bus 5
pciide0 at pci6 dev 0 function 0 "Marvell 88SE6121 SATA" rev 0xb2: DMA
(unsupported), channel 0 configured to native-PCI, channel 1 configured to
native-PCI
pciide0: using apic 8 int 16 for native-PCI interrupt
pciide0: channel 0 ignored (not responding; disabled or no drives?)
pciide0: channel 1 ignored (not responding; disabled or no drives?)
ppb6 at pci0 dev 28 function 5 "Intel 82801JI PCIE" rev 0x00: msi
pci7 at ppb6 bus 4
mskc1 at pci7 dev 0 function 0 "Marvell Yukon 88E8056" rev 0x12, Yukon-2 EC
Ultra rev. B0 (0x3): msi
msk1 at mskc1 port A: address 00:26:18:9f:4b:a3
eephy1 at msk1 phy 0: 88E1149 Gigabit PHY, rev. 1
uhci3 at pci0 dev 29 function 0 "Intel 82801JI USB" rev 0x00: apic 8 int 23
uhci4 at pci0 dev 29 function 1 "Intel 82801JI USB" rev 0x00: apic 8 int 19
uhci5 at pci0 dev 29 function 2 "Intel 82801JI USB" rev 0x00: apic 8 int 18
ehci1 at pci0 dev 29 function 7 "Intel 82801JI USB" rev 0x00: apic 8 int 23
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00
addr 1
ppb7 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0x90
pci8 at ppb7 bus 8
"VIA VT6306 FireWire" rev 0xc0 at pci8 dev 2 function 0 not configured
pcib0 at pci0 dev 31 function 0 "Intel 82801JIR LPC" rev 0x00
ahci0 at pci0 dev 31 function 2 "Intel 82801JI AHCI" rev 0x00: msi, AHCI 1.2
ahci0: port 0: 3.0Gb/s
ahci0: port 4: 3.0Gb/s
ahci0: port 5: 3.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, CT120BX500SSD1, M6C> SCSI3 0/direct fixed
naa.0000000000000000
sd0: 114473MB, 512 bytes/sector, 234441648 sectors, thin
sd1 at scsibus1 targ 4 lun 0: <ATA, HGST HTS725050A7, GH2Z> SCSI3 0/direct
fixed naa.5000cca7c5c227fa
sd1: 476940MB, 512 bytes/sector, 976773168 sectors
sd2 at scsibus1 targ 5 lun 0: <ATA, Hitachi HDP72505, GM4O> SCSI3 0/direct
fixed naa.5000cca359c3f5b0
sd2: 476940MB, 512 bytes/sector, 976773168 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 82801JI SMBus" rev 0x00: apic 8 int 18
iic0 at ichiic0
iic0: addr 0x1e 01=01 02=01 11=01 12=01 21=01 22=01 31=01 32=01 words 00=0001
01=0101 02=0100 03=0000 04=0000 05=0000 06=0000 07=0000
iic0: addr 0x20 01=80 02=17 03=7f 10=00 19=b0 20=20 21=00 25=20 26=b2 38=74
39=03 4a=99 6a=2c 78=02 79=08 7a=00 7b=00 7e=82 80=20 8b=47 8c=3d 96=99 99=41
9a=98 9b=01 d0=00 d1=03 d2=72 d3=72 d4=03 d5=02 d6=01 d7=56 d8=22 d9=00 da=00
db=00 dc=00 dd=00 de=00 df=10 e0=00 e1=00 e2=10 e3=0c e4=10 e5=10 e6=17 e7=10
e8=10 e9=10 ea=10 ec=07 ee=00 ef=00 f1=24 f5=01 f6=02 f9=cd fa=c0 fb=50 words
00=ffff 01=8037 02=1766 03=7fff 04=ffff 05=ffff 06=ffff 07=ffff
spdmem0 at iic0 addr 0x50: 2GB DDR3 SDRAM PC3-10600
spdmem1 at iic0 addr 0x52: 2GB DDR3 SDRAM PC3-10600
spdmem2 at iic0 addr 0x54: 2GB DDR3 SDRAM PC3-10600
usb2 at uhci0: USB revision 1.0
uhub2 at usb2 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00
addr 1
usb3 at uhci1: USB revision 1.0
uhub3 at usb3 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00
addr 1
usb4 at uhci2: USB revision 1.0
uhub4 at usb4 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00
addr 1
usb5 at uhci3: USB revision 1.0
uhub5 at usb5 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00
addr 1
usb6 at uhci4: USB revision 1.0
uhub6 at usb6 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00
addr 1
usb7 at uhci5: USB revision 1.0
uhub7 at usb7 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00
addr 1
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lm0 at isa0 port 0x290/8: W83627DHG
vmm0 at mainbus0: VMX/EPT (using slow L1TF mitigation)
uhub8 at uhub0 port 5 configuration 1 interface 0 "NEC hub" rev 2.00/1.00 addr 2
uhidev0 at uhub6 port 1 configuration 1 interface 0 "Holtek USB Keyboard" rev
1.10/1.05 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
uhidev1 at uhub6 port 1 configuration 1 interface 1 "Holtek USB Keyboard" rev
1.10/1.05 addr 2
uhidev1: iclass 3/1, 2 report ids
uhid0 at uhidev1 reportid 1: input=6, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd3 at scsibus3 targ 1 lun 0: <OPENBSD, SR RAID 1, 006> SCSI2 0/direct fixed
sd3: 476937MB, 512 bytes/sector, 976767473 sectors
root on sd0a (e91ba70896bdefb7.a) swap on sd0b dump on sd0b
initializing kernel modesetting (REDWOOD 0x1002:0x68D8 0x174B:0xE166 0x00).
radeondrm0: 1920x1200, 32bpp
wsdisplay0 at radeondrm0 mux 1: console (std, vt100 emulation), using wskbd0
wskbd1: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
