[asio-users] default_max_transfer_size

[Jim]

I'm trying to read a Windows file using asio random access handle, and it's
breaking down my transfer into 64K blocks.

This is my read command:


boost::asio::async_read_at(file_,
pos_*BUFSIZE,
boost::asio::buffer(buf_((pos_%2)*2+1),BUFSIZE),
strand_.wrap([this](boost::system::error_code ec,size_t
bytes)
{
read_complete(ec,bytes);
}
));


How do I get asio to request one 8M transfer? This is crushing the performance.

Thanks!