Re: [Bloat] ipspace.net: "QUEUING MECHANISMS IN MODERN SWITCHES"

2014-05-28 Thread Hal Murray
> in non discarding scheduling total delay is conserved, > irrespective of the scheduling discipline Is that true for all backplane/switching topologies? > The question is if (codel/pie/whatever) AQM makes sense at all for 10G/40G > hardware and higher performance irons? Igress/egress bandwidth

Re: [Bloat] ipspace.net: "QUEUING MECHANISMS IN MODERN SWITCHES"

2014-05-28 Thread Jonathan Morton
On 28 May, 2014, at 12:39 pm, Hal Murray wrote: >> in non discarding scheduling total delay is conserved, >> irrespective of the scheduling discipline > > Is that true for all backplane/switching topologies? It's a mathematical truth for any topology that you can reduce to a black box with one

Re: [Bloat] [Cerowrt-devel] Ubiquiti QOS

2014-05-28 Thread dpreed
Same concern I mentioned with Jim's message. I was not clear what I meant by "pacing" in the context of optimization of latency while preserving throughput. It is NOT just a matter of spreading packets out in time that I was talking about. It is a matter of doing so without reducing throug

Re: [Bloat] ipspace.net: "QUEUING MECHANISMS IN MODERN SWITCHES", > (Jonathan Morton)

2014-05-28 Thread David Collier-Brown
On 05/28/2014 11:33 AM, Jonathan Morton wrote > It's a mathematical truth for any topology that you can reduce to a black box > with one or more inputs and one output, which you call a "queue" and which > *does not discard* packets. Non-discarding queues don't exist in the real world, of course

Re: [Bloat] ipspace.net: "QUEUING MECHANISMS IN MODERN SWITCHES"

2014-05-28 Thread David Lang
On Tue, 27 May 2014, Hagen Paul Pfeifer wrote: The question is if (codel/pie/whatever) AQM makes sense at all for 10G/40G hardware and higher performance irons? Igress/egress bandwidth is nearly identical, a larger/longer buffering should not happen. Line card memory is limited, a larger bufferi

Re: [Bloat] ipspace.net: "QUEUING MECHANISMS IN MODERN SWITCHES"

2014-05-28 Thread David Lang
On Wed, 28 May 2014, Jonathan Morton wrote: On 28 May, 2014, at 12:39 pm, Hal Murray wrote: in non discarding scheduling total delay is conserved, irrespective of the scheduling discipline Is that true for all backplane/switching topologies? It's a mathematical truth for any topology that

Re: [Bloat] ipspace.net: "QUEUING MECHANISMS IN MODERN SWITCHES"

2014-05-28 Thread Bill Ver Steeg (versteb)
This really speaks to the difference between cross-traffic induced delay and self- induced delay. There are several toolkits that can be brought to bear, and we must be careful to examine the impact of each of them. The one that we tend to think about most (at least recently) is the AQM algorit