✎ soc:2010:cooldavid:journal:week11

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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|

=== Port wscale branch against current gPXE master ===
Recent TCP updates is a lot different from previous base of wscale branch.
Still working on it.

=== 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.)
  * Tested it with emulated rtl8139 of KVM, and Native on rtl8139 hardware.

^ Window Size ^   tcpfix2 branch    ^^    wscale branch    ^^
^             ^ KVM TAP/NAT ^ Native ^ KVM TAP/NAT ^ Native ^
|           8K|       17KB/s|        |             |        |
|          16K|       43KB/s|        |             |        |
|          32K|       94KB/s|        |             |        |
|          64K|      198KB/s|        |             |        |
|         128K|             |        |             |        |
|         256K|             |        |             |        |
|         512K|             |        |             |        |
|        1024K|             |        |             |        |

Trace: • dhcp_-_build_instructions • project_plan • windows_xp_iscsi • info • elf-ebi-initramfs-lnxi-howto • notes • notes • notes • project_plan • 2008 • mdeck • stefanha • debian_and_ubuntu • derekpryor-proposal • week4 • notes • week3 • notes • ideas