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Published 20 hours ago • verified publisher icon songgao

low performance of tap device on windows

Open snail007 opened this issue 6 years ago • 3 comments

I tried water on windos,use tap device process some IP packet traffic, such as : using mysql GUI client connect to local mysql server through tap device's IP,when opening table (less data),it is very slow , but without tap, it is very fast, i chehcked the go pprof ,find out that 99% CPU time is used by io.Copy. Looking forward to your suggestion!

snail007 avatar Aug 27 '18 10:08 snail007

Thank you for report this issue. If it is possible, can you provide the minimal code to reproduce the issue?

lixin9311 avatar Aug 29 '18 07:08 lixin9311

Thanks for your reply, attachment (sample.zip) is my go code and go pprof file. My Environment : System : windows7 64bit TAP driver : https://build.openvpn.net/downloads/releases/tap-windows-9.22.1-I602.exe Go version : 1.10.3 Localhost : MySQL Server MySQL GUI Client : navicat

Constantly opening a new table in navicat will reveal a slow response.

Looking forward to your reply.

sample.zip

snail007 avatar Aug 30 '18 03:08 snail007

You can change the TAP driver：https://build.openvpn.net/downloads/releases/tap-windows-9.9.2_3.exe For win7，the new drivers will cause low performance.

weiyixuan avatar May 07 '19 10:05 weiyixuan