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+
+Windows 2008/7 Guest to Guest Very slow 10-20Mbit/s
+
+I'm not sure if I'm submitting this to the proper place or not, if not, please direct me accordingly.
+
+At this point I'm starting to get desperate, I'll take any options or suggestions that spring to mind:
+
+Anyway, the problem exists on multiple hosts of various quality.   From 4 core 8g mem machines to 12 core 64Gig mem machines with LVM and Raid-10. 
+
+Using iperf as the testing utility: (windows guest can be either Windows 7 or 2008R2)
+-Windows Guest -> Windows Guest averages 20Mbit/s (The problem)
+-Windows Guest -> Host averages 800Mbit/s
+-Host -> Windows Guest averages 1.1Gbit/s
+-Linux Guest -> Host averages 12GBit/s
+-Linux Guest -> Linux Guest averages 10.2Gbit/s
+
+For windows guests, switching between e1000 and virtio drivers doesn't make much of a difference.  
+
+I use openvswitch to handle the bridging (makes bonding nics much easier) 
+
+Disabling TSO GRO on all the host nics, and virtual nics, as well as modding the registry using:
+netsh int tcp set global (various params here)  can slightly improve Windows -> windows throughput.   up to maybe 100Mbit/s    but even that is spotty at best.
+
+The Particulars of the fastest host which benchmarks about the same as the slowest host. 
+
+Ubuntu 12.04 64bit (updated to lastest as of  July 15th)
+Linux cckvm03 3.5.0-36-generic #57~precise1-Ubuntu SMP Thu Jun 20 18:21:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
+
+libvirt: 
+Source: libvirt
+Version: 0.9.8-2ubuntu17.10
+
+qemu-kvm
+Package: qemu-kvm
+Version: 1.0+noroms-0ubuntu14.8
+Replaces: kvm (<< 1:84+dfsg-0ubuntu16+0.11.0), kvm-data, qemu
+
+openvswitch
+Source: openvswitch
+Version: 1.4.0-1ubuntu1.5
+
+/proc/cpuifo
+
+processor       : 0
+vendor_id       : GenuineIntel
+cpu family      : 6
+model           : 45
+model name      : Intel(R) Xeon(R) CPU E5-2440 0 @ 2.40GHz
+stepping        : 7
+microcode       : 0x70d
+cpu MHz         : 2400.226
+cache size      : 15360 KB
+physical id     : 0
+siblings        : 12
+core id         : 0
+cpu cores       : 6
+apicid          : 0
+initial apicid  : 0
+fpu             : yes
+fpu_exception   : yes
+cpuid level     : 13
+wp              : yes
+flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
+pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdt
+scp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc ap
+erfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdc
+m pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm
+ida arat xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid
+bogomips        : 4800.45
+clflush size    : 64
+cache_alignment : 64
+address sizes   : 46 bits physical, 48 bits virtual
+power management:
+
+
+-Sample KVM line
+usr/bin/kvm -S -M pc-1.0 -enable-kvm -m 4096 -smp 2,sockets=2,cores=1,threads=1 -name gvexch01 -uuid d28ffb4b-d809-3b40-ae3d-2925e6995394 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/gvexch01.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -boot order=dc,menu=on -drive file=/dev/vgroup/gvexch01,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -drive file=/dev/vgroup/gvexch01-d,if=none,id=drive-virtio-disk1,format=raw,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk1,id=virtio-disk1 -drive if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=18,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:bf:4e:1c,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:2 -vga std -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
+\ No newline at end of file