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Re: [Openvpn-users] Bug in status.c when building with VC

  • Subject: Re: [Openvpn-users] Bug in status.c when building with VC
  • From: Blaine Fleming <groups@xxxxxxxxxxxxx>
  • Date: Thu, 09 Dec 2004 19:23:35 -0700

I tried the ICL non-static build.  It's nearly an order of magnitude slower
than my MinGW build (which is rc1 + a few inconsequential patches).  I'm not
totally clear what's going on, but one guess might be that in your ICL build,
the msg() and dmsg() functions in error.h are getting defined as functions,
not macros.  If this happens you will see a huge performance penalty -- on par

I never even thought about this. None of the MS compilers support these C99 features so ICL inherited this trait. To verify this problem, I replaced "#define msg x_msg" in error.h with "#define msg __noop" and the performance went through the roof. I was able to move about 18Mbps without the VPN (direct), 11Mbps with the VC builds and 16Mbps with the ICL build. These were all using the default cipher and auth settings. Running with no auth or cipher improved the speed by a pretty flat 2Mbps.

However, the MINGW build still performs very low. Even the binaries you provide in the installer run less than 500Kbps. Is it just me? All tests are performed between 2 windows boxes.

with what we are seeing here. And because VC apparently doesn't support
#warning, you won't even be warned about it at compile time. (Doesn't VC have
it's own version of #warning, like maybe #warn? -- if so I'd like to fix that
place in error.h where the warning is ifdefed out for VC.)

The replacement for warning I use is #pragma message("your comment here").

With the ICL build, the XP box is hitting 99% CPU usage in the openvpn process
while the linux server end of the connection is only seeing the openvpn daemon
hit 2 or 3% of CPU utilization.

Even with the same build you tested, I never saw my CPU usage hit above 10%. IPerf made it top out at about 8%, and these are some fairly old processors being used.

Does anyone know of a C99 capable preprocessor that will support macros with varargs? I would like to keep the VC/ICL builds going but don't want to completely rewrite the msg() routines.


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