Re: [Boost-users] [asio] Sending large packages

On Mon, Jan 4, 2010 at 7:30 AM, Jason Felice wrote:

On Mon, Jan 4, 2010 at 5:41 AM, Igor R wrote:

...

...

Doesn’t anyone have any ideas? Did anyone receive this mail?

I guess it's not an asio limitation, but the OS one - you just exceeded the maximum message size for the underlying protocol. On windows you can use SO_MAX_MSG_SIZE socket option to get the maximum size.

[...] All TCP networks have an MTU, and packets larger than this will be sliced up for delivery (without affecting the data contained within or the guaranteed order of delivery).

And herein lies what the original poster is hitting. The MTU is way smaller than the ~1MB limit the poster sees, so that isn't likely the problem (and would typically only be an issue if using UDP). My guess is the TCP read/write buffers have been exceeded. Original poster should include more information: - OS that this is on, - The actual error codes being encountered. If you're exceeding the TCP buffer sizes and trying to write in one chunk, you may be hitting an error like ENOBUFS (no_buffer_space in boost:error_code). Just a guess though.