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soc:2010:cooldavid:journal:week11 [2010/08/06 13:58]
cooldavid
soc:2010:cooldavid:journal:week11 [2010/08/07 04:03] (current)
cooldavid
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 +
 +==== Benchmark plan ====
   * Performance test sites   * Performance test sites
     * http://​netboot.me/​     * http://​netboot.me/​
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       * Bridge/NAT with TUN/TAP.       * Bridge/NAT with TUN/TAP.
     * Native gPXE.     * Native gPXE.
-  * Debug KVM suprt slow performance with user mode network stack.+  * 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| ​            ​| ​       |             ​| ​       |
  

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