Is there a way to duplicate the throughput of a single
TCP connection using two servers having two gigabit NICs?
I have tried using LACP but I cannot get more than
900MB of throughput...

dmesg both servers are equal:

OpenBSD 5.2 (GENERIC.MP) #368: Wed Aug  1 10:04:49 MDT 2012
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 2141519872 (2042MB)
avail mem = 2062200832 (1966MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0x7fb9c000 (64 entries)
bios0: vendor Dell Inc. version "2.0.1" date 10/27/2007
bios0: Dell Inc. PowerEdge 2950
acpi0 at bios0: rev 2
acpi0: sleep states S0 S4 S5
acpi0: tables DSDT FACP APIC SPCR HPET MCFG WDAT SLIC ERST HEST BERT EINJ TCPA
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: Intel(R) Xeon(R) CPU E5310 @ 1.60GHz, 1596.16 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,SBF,SSE3,MWAIT,DS-CPL,VMX,TM2,SSSE3,CX16,xTPR,PDCM,DCA,NXE,LONG,LAHF
cpu0: 4MB 64b/line 16-way L2 cache
cpu0: apic clock running at 265MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Xeon(R) CPU E5310 @ 1.60GHz, 1595.93 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,SBF,SSE3,MWAIT,DS-CPL,VMX,TM2,SSSE3,CX16,xTPR,PDCM,DCA,NXE,LONG,LAHF
cpu1: 4MB 64b/line 16-way L2 cache
cpu2 at mainbus0: apid 2 (application processor)
cpu2: Intel(R) Xeon(R) CPU E5310 @ 1.60GHz, 1595.93 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,SBF,SSE3,MWAIT,DS-CPL,VMX,TM2,SSSE3,CX16,xTPR,PDCM,DCA,NXE,LONG,LAHF
cpu2: 4MB 64b/line 16-way L2 cache
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Xeon(R) CPU E5310 @ 1.60GHz, 1595.93 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,SBF,SSE3,MWAIT,DS-CPL,VMX,TM2,SSSE3,CX16,xTPR,PDCM,DCA,NXE,LONG,LAHF
cpu3: 4MB 64b/line 16-way L2 cache
ioapic0 at mainbus0: apid 4 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 4
ioapic1 at mainbus0: apid 5 pa 0xfec81000, version 20, 24 pins
ioapic1: misconfigured as apic 0, remapped to apid 5
acpihpet0 at acpi0: 14318179 Hz
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 6 (PEX2)
acpiprt2 at acpi0: bus 7 (UPST)
acpiprt3 at acpi0: bus 8 (DWN1)
acpiprt4 at acpi0: bus 10 (DWN2)
acpiprt5 at acpi0: bus 1 (PEX3)
acpiprt6 at acpi0: bus 2 (PE2P)
acpiprt7 at acpi0: bus 12 (PEX4)
acpiprt8 at acpi0: bus 14 (PEX6)
acpiprt9 at acpi0: bus 4 (SBEX)
acpiprt10 at acpi0: bus 16 (COMP)
acpicpu0 at acpi0: C3
acpicpu1 at acpi0: C3
acpicpu2 at acpi0: C3
acpicpu3 at acpi0: C3
ipmi at mainbus0 not configured
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 5000X Host" rev 0x12
ppb0 at pci0 dev 2 function 0 "Intel 5000 PCIE" rev 0x12
pci1 at ppb0 bus 6
ppb1 at pci1 dev 0 function 0 "Intel 6321ESB PCIE" rev 0x01
pci2 at ppb1 bus 7
ppb2 at pci2 dev 0 function 0 "Intel 6321ESB PCIE" rev 0x01
pci3 at ppb2 bus 8
ppb3 at pci3 dev 0 function 0 "ServerWorks PCIE-PCIX" rev 0xc3
pci4 at ppb3 bus 9
bnx0 at pci4 dev 0 function 0 "Broadcom BCM5708" rev 0x12: apic 4 int 16
ppb4 at pci2 dev 1 function 0 "Intel 6321ESB PCIE" rev 0x01: msi
pci5 at ppb4 bus 10
ppb5 at pci1 dev 0 function 3 "Intel 6321ESB PCIE-PCIX" rev 0x01
pci6 at ppb5 bus 11
ppb6 at pci0 dev 3 function 0 "Intel 5000 PCIE" rev 0x12
pci7 at ppb6 bus 1
ppb7 at pci7 dev 0 function 0 "Intel IOP333 PCIE-PCIX" rev 0x00
pci8 at ppb7 bus 2
mfi0 at pci8 dev 14 function 0 "Dell PERC 5" rev 0x00: apic 5 int 14, 0x1f031028
mfi0: logical drives 1, version 5.2.1-0067, 256MB RAM
scsibus0 at mfi0: 1 targets
sd0 at scsibus0 targ 0 lun 0: <DELL, PERC 5/i, 1.03> SCSI3 0/direct
fixed naa.6001c230daeb98001352781c17f970ff
sd0: 278784MB, 512 bytes/sector, 570949632 sectors
ppb8 at pci7 dev 0 function 2 "Intel IOP333 PCIE-PCIX" rev 0x00
pci9 at ppb8 bus 3
ppb9 at pci0 dev 4 function 0 "Intel 5000 PCIE x8" rev 0x12: msi
pci10 at ppb9 bus 12
ppb10 at pci0 dev 5 function 0 "Intel 5000 PCIE" rev 0x12
pci11 at ppb10 bus 13
ppb11 at pci0 dev 6 function 0 "Intel 5000 PCIE x8" rev 0x12: msi
pci12 at ppb11 bus 14
ppb12 at pci0 dev 7 function 0 "Intel 5000 PCIE" rev 0x12
pci13 at ppb12 bus 15
"Intel I/OAT" rev 0x12 at pci0 dev 8 function 0 not configured
pchb1 at pci0 dev 16 function 0 "Intel 5000 Error Reporting" rev 0x12
pchb2 at pci0 dev 16 function 1 "Intel 5000 Error Reporting" rev 0x12
pchb3 at pci0 dev 16 function 2 "Intel 5000 Error Reporting" rev 0x12
pchb4 at pci0 dev 17 function 0 "Intel 5000 Reserved" rev 0x12
pchb5 at pci0 dev 19 function 0 "Intel 5000 Reserved" rev 0x12
pchb6 at pci0 dev 21 function 0 "Intel 5000 FBD" rev 0x12
pchb7 at pci0 dev 22 function 0 "Intel 5000 FBD" rev 0x12
ppb13 at pci0 dev 28 function 0 "Intel 6321ESB PCIE" rev 0x09
pci14 at ppb13 bus 4
ppb14 at pci14 dev 0 function 0 "ServerWorks PCIE-PCIX" rev 0xc3
pci15 at ppb14 bus 5
bnx1 at pci15 dev 0 function 0 "Broadcom BCM5708" rev 0x12: apic 4 int 16
uhci0 at pci0 dev 29 function 0 "Intel 6321ESB USB" rev 0x09: apic 4 int 21
uhci1 at pci0 dev 29 function 1 "Intel 6321ESB USB" rev 0x09: apic 4 int 20
uhci2 at pci0 dev 29 function 2 "Intel 6321ESB USB" rev 0x09: apic 4 int 21
ehci0 at pci0 dev 29 function 7 "Intel 6321ESB USB" rev 0x09: apic 4 int 21
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb15 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xd9
pci16 at ppb15 bus 16
vga1 at pci16 dev 13 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 4 int 19
drm0 at radeondrm0
pcib0 at pci0 dev 31 function 0 "Intel 6321ESB LPC" rev 0x09
pciide0 at pci0 dev 31 function 1 "Intel 6321ESB IDE" rev 0x09: DMA,
channel 0 configured to compatibility, channel 1 configured to
compatibility
atapiscsi0 at pciide0 channel 0 drive 0
scsibus1 at atapiscsi0: 2 targets
cd0 at scsibus1 targ 0 lun 0: <HL-DT-ST, CDRW/DVD GCCT10N, A102> ATAPI
5/cdrom removable
cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
pciide0: channel 1 ignored (disabled)
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 pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: 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
mtrr: Pentium Pro MTRR support
uhub4 at uhub0 port 5 "Cypress Semiconductor USB2 Hub" rev 2.00/0.0b addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a swap on sd0b dump on sd0b
bnx0: address 00:1c:23:d3:70:f8
brgphy0 at bnx0 phy 1: BCM5708C 10/100/1000baseT PHY, rev. 6
bnx1: address 00:1c:23:d3:70:f6
brgphy1 at bnx1 phy 1: BCM5708C 10/100/1000baseT PHY, rev. 6
bnx0: Watchdog timeout occurred, resetting!
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
bnx0: Watchdog timeout occurred, resetting!
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
arp info overwritten for 148.244.191.20 by 00:1d:09:f0:f9:83 on bnx0
bnx0: Watchdog timeout occurred, resetting!
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1
splassert: assertwaitok: want -1 have 1

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