Re: [MirageOS-devel] OPW intern checking in!

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

(Hello from the Xen hackathon!)

The Cohttp issue is on my queue now, so investigating the corners of the TCP 
stack is definitely a useful thing.  Closing down a TCP connection is 
surprisingly complex (and often papered over by the other side sending an RST), 
so chasing down this part of the stack is a *very* useful thing to look at...

-anil

On 28 May 2014, at 14:57, Mindy <mindy@xxxxxxxxxxxxxxxxxxx> wrote:

> Hi again!  It was nice to talk with those of you who were on the call 
> yesterday. :)
> 
> I owe some unit tests for the issue I reported with Cohttp, so I'll be 
> learning how to OUnit and writing some tests for that.
> 
> I had great intentions of looking into some client-side fuzzing with the 
> Cohttp libraries yesterday, but got distracted looking into something I 
> noticed from my server-side testing - it seems like self-initiated TCP 
> connection closures in Mirage don't work as expected some very high 
> percentage (so far, 100) of the time, at least when built for Xen.  (To 
> phrase this differently, no running unikernel I've seen has ever sent a FIN 
> packet, even when `close` is invoked; they do respond correctly to 
> well-formed FIN packets.)  I started looking into why this would be and 
> quickly got sucked into reading code in mirage-tcpip/tcp.  I'd like to finish 
> investigating what's going on there (i.e. make sure I'm not making some silly 
> mistake) and submit an issue, with hopes that I can submit a PR for a fix 
> soon after.
> 
> I promised to have a look at irmin as well; I'll likely do that in the late 
> afternoon.
> 
> Thanks,
> Mindy
> 
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