[Sstp-client-devel] Performance problems on Mac OS-X

[Eivind N. <ei...@ya...>]

Guys,

I have one problem that I like some help with. Apparently, if I run sstp-client on a Mac OS-X 10.7.3 the performance of the SSTP connection is pretty bad. Using Xcode and Instruments, I am able to detect the function utf8_encodelen being one of the culprits consuming lots of time when writing data to pppd over a pseudo terminal socket. 

I have tried to setup a termios structure and disable UTF encoding, and/or making the socket "raw" by setting cfmakeraw(termios *p). Not any of these improved the performance. Is there anyone out there that can post this to Apple Support forum, or have a clue on how to improve this (without claiming a re-design)?

Regards,
- Eivind

Running TimeSelfSymbol Name
25245.0ms  100.0%0.0 Main Thread
25180.0ms   99.7%0.0  start
25180.0ms   99.7%0.0   main
25137.0ms   99.5%132.0    event_base_loop
19765.0ms   78.2%22.0     sstp_recv_cont
12034.0ms   47.6%12.0      sstp_state_recv
11933.0ms   47.2%15.0       sstp_pppd_send
10607.0ms   42.0%24.0        write
10508.0ms   41.6%11.0         unix_syscall64
10479.0ms   41.5%7.0          write_nocancel
10447.0ms   41.3%4.0           writev
10426.0ms   41.2%18.0            utf8_encodelen