3 ms·
> ICQ has its own TCP/IP implementation which works in the user space; Mind expanding a little bit why is that?
by 4ad 10y ago
> ICQ has its own TCP/IP implementation which works in the user space;
Mind expanding a little bit why is that?
- oxymoron 10y agoProbably to minimize context switching?
- pimeys 10y agoCould it be because of the age of the codebase? When ICQ started the available TCP/IP stacks were not good enough and it doesn't make sense to refactor the whole project to use the system stack.
- hal9000xp 10y agoYes, that's mostly true. In early days, native TCP/IP stacks wasn't good at handling so many simultaneous connections as ICQ needed to handle. So AOL just wrote their own TCP/IP stack (I think they used this implementation not only in ICQ). In modern days, it's legacy. I think they already removed this stack since I left company.
- deleted 10y ago[deleted]