Date: Tue, 12 May 2015 20:13:27 -0400 From: "George Neville-Neil" <gnn@neville-neil.com> To: "Karlis Laivins" <karlis.laivins@gmail.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: <7B9881D7-F321-48F8-A38A-7B0D0B147F71@neville-neil.com> In-Reply-To: <CAF4H_7=fG=izGbqBQ8kY95SW1AXtsfE8%2BafxzWyEdCtRiwv_pA@mail.gmail.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> <CAF4H_7=fG=izGbqBQ8kY95SW1AXtsfE8%2BafxzWyEdCtRiwv_pA@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Sounds good. Best, George On 1 May 2015, at 1:21, Karlis Laivins wrote: > 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 >>>> >>>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?7B9881D7-F321-48F8-A38A-7B0D0B147F71>