http://etherboot.org/wiki/ 2026-04-04T03:11:53-07:00 http://etherboot.org/wiki/ http://etherboot.org/wiki/lib/tpl/monobook/images/favicon.ico text/html 2010-05-12T01:32:17-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/benchmark?rev=1273653137&do=diff Guo-Fu Tseng: Implement and Port Ethernet Drivers for gPXE Notes: TCP Window Size and RX Csum Offload Benchmark I've done some benchmark with imgfetch a 500MByte image via HTTP. The test was done by directly connect two computer with a CAT.6 cable: text/html 2010-05-15T07:11:56-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/bkobench?rev=1273932716&do=diff Test image: <http://130.239.17.17/bko/live/fedora/f13-alpha/i686/initrd0.img> This benchmark downloads the image from bko via local DHCP/NAT server. The following are dstat outputs against different code branch. (With extra modification: #define TCP_MAX_WINDOW_SIZE ( 65536 - 4 )) With jme driver <http://git.etherboot.org/?p=people/cooldavid/gpxe.git;a=shortlog;h=refs/heads/jme_driver> 4096 TCP_MAX_WINDOW_SIZE text/html 2010-06-04T01:23:51-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/expandheap?rev=1275639831&do=diff Expand gPXE heap Real-mode compatibility The gPXE's code can be executed on both real-mode and protected-mode because of the GDT's base address was filled with the starting point of the code. Which makes all the function, global variable's pointer valid between the transition. text/html 2010-06-02T13:12:02-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/gpxememlayout?rev=1275509522&do=diff gPXE memory layout Currently the linker script for each arch is locate at: * src/arch/x86/scripts/efi.lds * src/arch/i386/scripts/i386-kir.lds * src/arch/i386/scripts/i386.lds We can reference src/arch/i386/README.i386 for the difference between text/html 2010-07-17T20:59:00-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/gpxeprogflow?rev=1279425540&do=diff gPXE Program Flow Prefixes * The very first entry point of gPXE * Image type and architecture dependent * Mostly written in assembly * Setup basic hardware environment * Virtual memory * Interrupt services. * Bus status. * Disk status. text/html 2010-07-17T20:19:57-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/start?rev=1279423197&do=diff Guo-Fu Tseng: Implement and Port Ethernet Drivers for gPXE Notes * TCP Window Size and RX Csum Offload Benchmark * TCP Stack Trace Note * TCP out-of-order receive dstat test logs * Benchmarks for downloading image from boot.kernel.org * gPXE memory layout * Expand gPXE heap * gPXE Program Flow text/html 2010-05-15T05:03:23-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/tcpoorxtest?rev=1273925003&do=diff TCP out-of-order receive dstat test logs The setup is same as TCP Window Size and RX Csum Offload Benchmark except with following netem parameters bind to the server interface. tc qdisc add dev eth0 root netem loss 0.3% 25% duplicate 1% delay 10ms reorder 25% 50% Following test shows the result of this patch: text/html 2010-05-12T14:55:39-07:00 http://etherboot.org/wiki/soc/2010/cooldavid/notes/tracetcpstack?rev=1273701339&do=diff TCP Out-Of-Order Receving handling It's a little tricky about already_rcvd (uint32_t). if tcp->rcv_ack == seq : Normal case * already_rcvd = 0 if tcp->rcv_ack > seq : Segment contains previous data * already_rcvd = small positive number if