niedz., 26 sie 2018 o 03:36 Jan Ehrhardt via curl-library <curl-library@cool.haxx.se> napisał(a): > Do you have any stats about the performanceimprovement?
Workbench: I am running curl against openssh 7.2 shipped with Ubuntu. The server is running on the same machine as the client. I am uploading 1GB file to /dev/null on the server. My laptop is running a 2nd gen i3 CPU without hardware AES support. I'm tweaking network latency using tc. Curl speed was taken from curl-reported average when the transfer took less than a minute. For slower transfers I took a representative value from the momentary upload speed. Results with 16kB curl upload buffer: no delay added: original 12MB/sec, patched 33 MB/sec added 20 ms: original 390kB/sec, patched 26.6 MB/sec added 100ms: original 81 kB/sec, patched 9700 kB/sec Results with 64kB curl upload buffer: no delay added: original 27MB/sec, patched 35 MB/sec added 20 ms: original 1400kB/sec, patched 30MB/sec added 100ms: original 310kB/sec, patched 9900kB/sec The patched version is CPU-bound on lower latencies; when the latency goes higher, SSH window becomes the limiting factor. I read that HPN SSH should do better on high latency links, didn't try it out. Separately I have a work-in-progress patch that improves the CPU usage; I was able to reach 80MB/s transfers with that patch applied. You can see it here: https://github.com/djelinski/libssh2/commit/c321b5d3a0ed964b291c710179dde7385e514ef7 It's not ready for inclusion; it requires cleanup, and breaks SSL backends other than openSSL with AES-CTR support. If you have openSSL with AES support, it might be worth a try. ------------------------------------------------------------------- Unsubscribe: https://cool.haxx.se/list/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html