Hi,

  I had a pair of Dell PowerEdge R200s that have both em(4) and bge(4)s 
in them, however, it's the em(4) doing the heavy lifting. Roughly 30-40 
megabits/s sustained and doing anywhere between 3000-4000 packets/s.

  On OpenBSD 4.4, it happily forwards packets along. I upgraded one of 
the firewalls to 4.8 and switched CARP over to it (yes, I know the 
redundancy is broken anyway now.) and it couldn't seem to handle the 
traffic. Any inbound connections would stall and I have no idea why.

  There were no net.inet.ip.ifq.drops, but I noticed 10 livelocks when
running systat mbufs (on em0). Could MCLGETI be hindering performance?
Is there anything I can try?

   Tom

OpenBSD 4.8 (GENERIC) #136: Mon Aug 16 09:06:23 MDT 2010
    dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz ("GenuineIntel" 686-class) 
2.21 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,SBF,SSE3,MWAIT,DS-CPL,EST
,TM2,SSSE3,CX16,xTPR,PDCM
real mem  = 1071947776 (1022MB)
avail mem = 1044451328 (996MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 10/24/07, BIOS32 rev. 0 @ 0xfadd0, SMBIOS 
rev. 2.5 @ 0x3ff9c000 (46 entries)
bios0: vendor Dell Inc. version "1.0.0" date 10/24/2007
bios0: Dell Inc. PowerEdge R200
acpi0 at bios0: rev 2
acpi0: sleep states S0 S4 S5
acpi0: tables DSDT FACP APIC SPCR HPET MCFG WD__ SLIC ERST HEST BERT EINJ SSDT 
SSDT SSDT
acpi0: wakeup devices PCI0(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 200MHz
cpu at mainbus0: not configured
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 2
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (PEX1)
acpiprt2 at acpi0: bus 2 (SBE0)
acpiprt3 at acpi0: bus 3 (SBE4)
acpiprt4 at acpi0: bus 4 (SBE5)
acpiprt5 at acpi0: bus 5 (COMP)
acpicpu0 at acpi0: PSS
bios0: ROM list: 0xc0000/0x9000 0xec000/0x4000!
ipmi at mainbus0 not configured
cpu0: Enhanced SpeedStep 2201 MHz: speeds: 2200, 2000, 1800, 1600, 1400, 1200 
MHz
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "Intel 3200/3210 Host" rev 0x01
ppb0 at pci0 dev 1 function 0 "Intel 3200/3210 PCIE" rev 0x01: apic 2 int 16 
(irq 15)
pci1 at ppb0 bus 1
ppb1 at pci0 dev 28 function 0 "Intel 82801I PCIE" rev 0x02: apic 2 int 16 (irq 
15)
pci2 at ppb1 bus 2
em0 at pci2 dev 0 function 0 "Intel PRO/1000 PT (82571EB)" rev 0x06: apic 2 int 
16 (irq 15), address 00:15:17:6c:c7:a2
em1 at pci2 dev 0 function 1 "Intel PRO/1000 PT (82571EB)" rev 0x06: apic 2 int 
17 (irq 14), address 00:15:17:6c:c7:a3
ppb2 at pci0 dev 28 function 4 "Intel 82801I PCIE" rev 0x02
pci3 at ppb2 bus 3
bge0 at pci3 dev 0 function 0 "Broadcom BCM5721" rev 0x21, BCM5750 C1 (0x4201): 
apic 2 int 16 (irq 15), address 00:19:b9:fa:59:20
brgphy0 at bge0 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0
ppb3 at pci0 dev 28 function 5 "Intel 82801I PCIE" rev 0x02
pci4 at ppb3 bus 4
bge1 at pci4 dev 0 function 0 "Broadcom BCM5721" rev 0x21, BCM5750 C1 (0x4201): 
apic 2 int 17 (irq 14), address 00:19:b9:fa:59:21
brgphy1 at bge1 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0
uhci0 at pci0 dev 29 function 0 "Intel 82801I USB" rev 0x02: apic 2 int 21 (irq 
11)
uhci1 at pci0 dev 29 function 1 "Intel 82801I USB" rev 0x02: apic 2 int 20 (irq 
10)
uhci2 at pci0 dev 29 function 2 "Intel 82801I USB" rev 0x02: apic 2 int 21 (irq 
11)
ehci0 at pci0 dev 29 function 7 "Intel 82801I USB" rev 0x02: apic 2 int 21 (irq 
11)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb4 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0x92
pci5 at ppb4 bus 5
vga1 at pci5 dev 5 function 0 "ATI ES1000" rev 0x02
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
radeondrm0 at vga1: apic 2 int 19 (irq 5)
drm0 at radeondrm0
ichpcib0 at pci0 dev 31 function 0 "Intel 82801IR LPC" rev 0x02: PM disabled
pciide0 at pci0 dev 31 function 2 "Intel 82801I SATA" rev 0x02: DMA, channel 0 
configured to native-PCI, channel 1 configured to native-PCI
pciide0: using apic 2 int 23 (irq 6) for native-PCI interrupt
wd0 at pciide0 channel 0 drive 0: <WDC WD1601ABYS-18C0A0>
wd0: 16-sector PIO, LBA48, 152587MB, 312500000 sectors
atapiscsi0 at pciide0 channel 0 drive 1
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <HL-DT-ST, CDRW/DVD GCCT10N, A102> ATAPI 5/cdrom 
removable
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6
cd0(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 2
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
isa0 at ichpcib0
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
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
mtrr: Pentium Pro MTRR support
uhub4 at uhub0 port 5 "Cypress Semiconductor USB2 Hub" rev 2.00/0.0b addr 2
softraid0 at root
root on wd0a swap on wd0b dump on wd0b

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