Re: [hops] Questions to ask
"Scharf, Michael (Michael)" <michael.scharf@alcatel-lucent.com> Fri, 04 September 2015 17:03 UTC
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From: "Scharf, Michael (Michael)" <michael.scharf@alcatel-lucent.com>
To: Christian Kuhtz <chkuhtz@microsoft.com>, Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>, "hops@ietf.org" <hops@ietf.org>
Thread-Topic: [hops] Questions to ask
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Date: Fri, 04 Sep 2015 17:03:04 +0000
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Cc: Brian Trammell <ietf@trammell.ch>
Subject: Re: [hops] Questions to ask
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Hi Christian, I was referring to the problems TCPM currently faces with extending the option space. One specific example found so far in prototypes is explained in: https://www.ietf.org/proceedings/93/slides/slides-93-tcpm-1.pdf Slide 4 This is related to the segmentation/reassembly engines. And in TCPM there is currently a lot of uncertainty how TCP offload engines would deal with unknown TCP options, long options, etc. Measurements could perhaps help to reduce that uncertainty. I am not sure why historic behavior should matter. In TCPM we wonder whether something like EDO could get widely deployed in the *current* Internet, and we lack data for answering that question. Michael > -----Original Message----- > From: Christian Kuhtz [mailto:chkuhtz@microsoft.com] > Sent: Friday, September 04, 2015 6:29 PM > To: Scharf, Michael (Michael); Mirja Kühlewind; hops@ietf.org > Cc: Brian Trammell > Subject: RE: [hops] Questions to ask > > Michael, > > > I think TCPM would also be interested quite a bit in real-world > measurement data on impairments resulting from the endsystem network > stack itself, e.g., "broken" TCP HW offloading on NICs. > > Can you please elaborate what you're referring to? Are you talking > about historic behavior or current state of the art behaviors? > > If current state of the art, can you be specific on context please? > > Thanks in advance. > > Best regards, > Christian > > -----Original Message----- > From: hops [mailto:hops-bounces@ietf.org] On Behalf Of Scharf, Michael > (Michael) > Sent: Friday, September 4, 2015 7:34 AM > To: Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>; hops@ietf.org > Cc: Brian Trammell <ietf@trammell.ch> > Subject: Re: [hops] Questions to ask > > I think TCPM would also be interested quite a bit in real-world > measurement data on impairments resulting from the endsystem network > stack itself, e.g., "broken" TCP HW offloading on NICs. > > Any data on that would really be welcome in TCPM (in particular in the > context of EDO). > > Michael > > > > -----Original Message----- > > From: hops [mailto:hops-bounces@ietf.org] On Behalf Of Mirja > Kühlewind > > Sent: Friday, September 04, 2015 3:39 PM > > To: hops@ietf.org > > Cc: Brian Trammell > > Subject: [hops] Questions to ask > > > > Hi again, > > > > at the last meeting, the main interest of the group (for now as a > > starting > > point) was to collect and see measurement data. However, collecting > > random measurement data might not be the most useful thing to do and > > makes it also often difficult to get access to existing data sets. > > While the focus of the proposed hops group is clearly on measurement > > of middlebox impairments, we believe we could even be more specific > > than that and try to tackle certain questions that you like an answer > > for or that have been raised lately in some context e.g. other > working > > group. > > > > One example is on UDP impairments because there are a bunch of new > > protocols that have chosen to encapsulate over UDP to enable Internet > > path traversal (or at least make it more likely to be able to > > connect). The questions here > > are: > > > > - How likely is it that your traffic will be fully blocked if you use > > (a new unknown protocol over) UDP? > > > > - How likely is it that your UDP traffic is throttled to a certain > > rate while TCP traffic on the same path is not? > > > > There might be even more questions in this context (but these are the > > ones we are actually currently working on). > > > > So now, the purpose of this email is, to collect more of these > > questions such that we can use this working group as a forum to find > a > > match between people that have a question and people that have the > > data to (at least > > partially) > > answer that question. > > > > Therefore please send questions to the list! Or start a discussion on > > what areas we might want to focus on so that we as a group can try to > > find the right questions! Or if you have data, tell us which > questions > > you can already answer or at least (at high level) which kind of data > > you have! > > > > Thanks, > > Brian and Mirja > > > > _______________________________________________ > > hops mailing list > > hops@ietf.org > > > https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fwww.i > > > etf.org%2fmailman%2flistinfo%2fhops&data=01%7c01%7cchkuhtz%40microsoft > > > .com%7c3e26e4bef2a84b2b8f1c08d2b535e560%7c72f988bf86f141af91ab2d7cd011 > > db47%7c1&sdata=jrCFwXC5VUY0RMmxX7CyuB%2f1upswnsZvt%2bm11A1ktvQ%3d > > _______________________________________________ > hops mailing list > hops@ietf.org > https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fwww.ie > tf.org%2fmailman%2flistinfo%2fhops&data=01%7c01%7cchkuhtz%40microsoft.c > om%7c3e26e4bef2a84b2b8f1c08d2b535e560%7c72f988bf86f141af91ab2d7cd011db4 > 7%7c1&sdata=jrCFwXC5VUY0RMmxX7CyuB%2f1upswnsZvt%2bm11A1ktvQ%3d
- [hops] Questions to ask Mirja Kühlewind
- Re: [hops] Questions to ask Scharf, Michael (Michael)
- Re: [hops] Questions to ask Christian Kuhtz
- Re: [hops] Questions to ask Scharf, Michael (Michael)