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Why do you think it's a qemu-kvm bug (not virtio-net driver)?
did you tested with latest rhel6.5 & rhel7 guest?
2.6.16 was released in Mar of 2006, it's too old.
Description of problem: could not set mtu > 1500 when using virtio-net on SLES 10 SP4 guest Version-Release number of selected component (if applicable): Host: qemu-img-rhev-0.12.1.2-2.415.el6.x86_64 kernel-2.6.32-428.el6.x86_64 Guest: # uname -r 2.6.16.60-0.85.1-default How reproducible: 100% Steps to Reproduce: 1. boot SLES 10 SP4 guest with virtio-net nic /root/staf-kvm-devel/autotest-devel/client/tests/virt/qemu/qemu \ -S \ -name 'virt-tests-vm1' \ -nodefaults \ -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20131105-232306-xg7IopJV,server,nowait \ -mon chardev=qmp_id_qmpmonitor1,mode=control \ -chardev socket,id=serial_id_serial1,path=/tmp/serial-serial1-20131105-232306-xg7IopJV,server,nowait \ -device isa-serial,chardev=serial_id_serial1 \ -chardev socket,id=seabioslog_id_20131105-232306-xg7IopJV,path=/tmp/seabios-20131105-232306-xg7IopJV,server,nowait \ -device isa-debugcon,chardev=seabioslog_id_20131105-232306-xg7IopJV,iobase=0x402 \ -device ich9-usb-uhci1,id=usb1,bus=pci.0,addr=0x4 \ -drive file='/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/images/sles10-64-virtio.qcow2',index=0,if=none,id=drive-virtio-disk1,media=disk,cache=none,snapshot=off,format=qcow2,aio=native \ -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,bootindex=0 \ -device virtio-net-pci,netdev=idmO1hp9,mac='9a:f4:f5:f6:f7:f8',bus=pci.0,addr=0x6,id='idtrVx6E' \ -netdev tap,id=idmO1hp9,vhost=on,vhostfd=25,fd=24 \ -m 2048 \ -smp 2,maxcpus=2,cores=1,threads=1,sockets=2 \ -cpu 'Penryn' \ -M rhel6.5.0 \ -device AC97,addr=0x7 \ -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \ -vnc :0 \ -vga cirrus \ -rtc base=utc,clock=host,driftfix=slew \ -boot order=cdn,once=c,menu=off \ -no-kvm-pit-reinjection \ -enable-kvm 2. change Ethernet mtu > 1500 in guest ifconfig eth6 mtu 65520 3. Actual results: set failed, error info: "SIOCSIFMTU: Invalid argument" Expected results: set mtu=65520 ok Additional info: 1. rtl8139, e1000 can set successfully rtl8139: max mtu=1500 e1000: max mtu=16110