Date: Fri, 1 May 2015 08:21:20 +0300 From: Karlis Laivins <karlis.laivins@gmail.com> To: George Neville-Neil <gnn@neville-neil.com> Cc: "Eggert, Lars" <lars@netapp.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, grenville armitage <garmitage@swin.edu.au> Subject: Re: Congestion Control Modification Message-ID: <CAF4H_7=fG=izGbqBQ8kY95SW1AXtsfE8%2BafxzWyEdCtRiwv_pA@mail.gmail.com> In-Reply-To: <8D3AEF2A-1413-4C44-9E5C-66900847F18A@neville-neil.com> References: <CAF4H_7mSGp_GZGaDBx8xq47FY1j85xLHq%2BZY1jMzprbzp%2Bg9zw@mail.gmail.com> <5535945F.90504@swin.edu.au> <CAF4H_7nOJP=Wy7LJSBi2PGupnMMvZu0xYeT2iYjhKDg-DPC6fw@mail.gmail.com> <F572540B-45C8-4EBF-9E18-7CA7E30CFD0C@neville-neil.com> <CAF4H_7=WZTmNUaS9x0DJh1YNRzFCJPbqJ_eFp12=z8snvTpn3g@mail.gmail.com> <98E7D40A-EC37-413D-85CE-2A6012811E08@netapp.com> <CAF4H_7=uV8ng-%2BY93wR88-aeW19HabaqR0iVkDXf6yujE4Wbpw@mail.gmail.com> <8D3AEF2A-1413-4C44-9E5C-66900847F18A@neville-neil.com>
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Hello George, Thank you for the tip! I have set up a virtual test environment with IMUNES (interesting tool, by the way) and now I am running validation tests, to see, if the results there are at least similar to those that can be achieved on a physical testbed. I will let you know if and when the implementation will be done as I will certainly need objective feedback. BR, Karlis On Fri, May 1, 2015 at 12:06 AM, George Neville-Neil <gnn@neville-neil.com> wrote: > If you want to run some experiments, though, you could look at running PTPd > on 3 servers (master, and two slaves) which will get you decent > synchronization > among the three. Where decent is less than the typical RTT of a TCP > packet on a > 1Gbps LAN. > > Best, > George > > > On 30 Apr 2015, at 14:48, Karlis Laivins wrote: > > Yes, you are correct, I meant to write "relative OWD". As David Hayes put >> it - "Relative OWD measurements are easier, and clock drift is not usually >> a problem over the time it takes to send and receive an ACK". >> >> Thank you for the correction! >> >> On Thu, Apr 30, 2015 at 4:19 PM, Eggert, Lars <lars@netapp.com> wrote: >> >> On 2015-4-30, at 15:04, Karlis Laivins <karlis.laivins@gmail.com> wrote: >>> >>>> I have yet to solve the issue of >>>> how to get the One Way Delay for the ACK message (the time it takes ACK >>>> >>> to >>> >>>> arrive from receiver of the ACK'ed data sender) correctly. >>>> >>> >>> That won't work without synchronized clocks, which you can't really >>> assume >>> to be present. >>> >>> Lars >>> >>
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