ioctl() on socket fd's take 3 seconds on 1.7.7

Jason Curl
Tue Nov 23 14:53:00 GMT 2010

Corinna Vinschen <corinna-cygwin <at>> writes:

> On Nov 22 21:29, Jason Curl wrote:
> > The actual delays are caused by SendARP() called from get_xp_ifs().
> > Interestingly enough, it isn't always slow, only sometimes.
> > [...]
> First of all, thanks for looking deeper into this.

Thanks for taking notice for my initial problem.

> This autoconfig address is returned by GetAdapterAddresses so it has
> been configured at one point, even if the interface is not visible.
> Ok, so SendARP is kind of a problematic call.  As you can see from the
> source code, it's only called to set the IFF_NOARP flag.  Probably
> that's a bit over the top.  What about just disabling this code?

I'll try this out on my next opportunity. I personally have no need for 


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