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==== Benchmark plan ==== * Performance test sites * http://netboot.me/ * http://boot.fedoraproject.org/index * http://boot.kernel.org/ * Test env: * KVM with different kind of emulated NIC. * Direct link. * User mode network stack. * With TUN/TAP * Bridge/NAT with TUN/TAP. * Native gPXE. * Trace the issue that gPXE download speed slow on KVM. ==== Benchmark result ==== === KVM-QEMU TAP versus User mode network stack === * This benchmark is addressed on the difference between user-mode-network-stack and tap interface of qemu-kvm. * Image is placed on Host OS, to minimize the real network effect. * Parameters for user mode network stack: ''-net nic -net user,tftp=/tftproot,bootfile=gpxe_script'' * Parameters for TAP network: ''-net nic -net tap,ifname=tap0,script=no'' * Default interface for guest OS is Realtek 8139. * Get a disk image with 268,435,456 bytes. ^ Network type ^ Linux wget ^^ gPXE 8K Window ^^ gPXE 64K Window ^^ | User mode| 476KB/s| 550s| 298KB/s| 880s| 298KB/s| 879s| | TAP| 36MB/s| 7s| 5243KB/s| 50s| 495KB/s| 529s| === Window size difference === * Test target image on BKO: http://130.239.17.17/bko/live/fedora/f13-alpha/i686/initrd0.img * Image size: 43,355,267 bytes * Linux wget speed: 1MByte/s (My Internet link speed is 10Mbit/s, it's about the full spped.) * Still porting wscale branch. ^ Window Size ^ tcpfix2 branch ^ wscale branch ^ | 8K| 17KB/s| | | 16K| 43KB/s| | | 32K| 94KB/s| | | 64K| 198KB/s| | | 128K| | | | 256K| | | | 512K| | | | 1024K| | |


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