[Devel] Re: MCR

[Masahiko Takahashi]

Hi folks,

On Thu, 2006-12-14 at 11:01 +0100, Daniel Lezcano wrote:
> Perhaps, it could work, perhaps not. To use the zero window we should 
> check that all TCP stacks are compatible with that. If we have a server 
> running on linux and we checkpoint it, it will not be cool if all 
> windows client lose their connecions while all linux client or mac 
> clients stay blocked.

I understand what you mean. We should take a conservative
way, even if dropping packets results in shrinking the
window size.

> > It seems we should check there is no packet in receive_queue
> > before closing the socket. If there is, the kernel tries to
> > send a RESET packet.
> 
> The receive and the send queue are checkpointed. If the receive queue is 
> not flushed before destroying the socket, there is no issue because the 
> RST packet will be dropped because of the blocked traffic.

You are right. I forgot that all packets would be dropped
after checkpointing in MCR.


Thanks,

Masahiko.


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