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soc:2010:cooldavid:journal:week11 [2010/08/07 01:32] cooldavid |
soc:2010:cooldavid:journal:week11 [2010/08/07 04:03] (current) cooldavid |
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| ==== Benchmark plan ==== | ==== Benchmark plan ==== | ||
| * Performance test sites | * Performance test sites | ||
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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 ==== | ==== Benchmark result ==== | ||
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| === KVM-QEMU TAP versus User mode network stack === | === KVM-QEMU TAP versus User mode network stack === | ||
| - | * Parameters for user mode network stack: "-net nic -net user" | + | * This benchmark is addressed on the difference between user-mode-network-stack and tap interface of qemu-kvm. |
| - | * Parameters for TAP network: "-net nic -net tap,ifname=tap0,script=no" | + | * 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. | * Default interface for guest OS is Realtek 8139. | ||
| * Get a disk image with 268,435,456 bytes. | * Get a disk image with 268,435,456 bytes. | ||
| - | * Image is placed on Host OS. | ||
| ^ Network type ^ Linux wget ^^ gPXE 8K Window ^^ gPXE 64K Window ^^ | ^ Network type ^ Linux wget ^^ gPXE 8K Window ^^ gPXE 64K Window ^^ | ||
| - | | User mode| 550s| 476KB/s| 298KB/s| 880s| 298KB/s| 879s| | + | | User mode| 476KB/s| 550s| 298KB/s| 880s| 298KB/s| 879s| |
| - | | TAP| 7s| 36MB/s| 5243KB/s| 50s| 495KB/s| 529s| | + | | 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| | | | | | ||
