On January 12, 2014 03:39:39 PST, Damien Miller wrote: >> * during the time where any web-page is in the process of timing out >> (which, as mentioned, takes many seconds), the terminal is stalling, >> too; basically, the terminal is just about entirely unusable -- the >> stalls persist for dozens of seconds at a time; remove dynamic port >> forwarding, wait for the timeouts to expire, and the terminal stalls >> no more, not even a little bit > > Yes, OpenSSH uses the standard libc resolver to perform name > resolution. This is synchronous and blocking, so no other traffic > is processed while one is in progress. > > Fixing this would require an asynchronous resolver. It's probably > worth doing, but we'd need to select one and integrate it with the > channels code. Depending on the resolver, this could be a little > or a lot of work. I suggest looking at c-ares (http://c-ares.haxx.se/) which seems to have a compatible license and is one of the resolver options for both curl and wireshark. There's a working source code example at [1]. Kyle [1] http://stackoverflow.com/questions/4854284/how-do-i-resolve-an-ip-into-host-using-c-ares
