On May 8, 2011, at 5:34 AM, Richard Scheffenegger wrote:
> Goodput can really only be measured at the sender; by definition, any
> retransmitted packet will reduce goodput vs throughput; In your example,
> where each segment is retransmitted once, goodput would be - at most - 0.5,
> not 1.0...
- Original Message -
From: "Fred Baker"
To: "richard"
Cc:
Sent: Friday, May 06, 2011 11:56 PM
Subject: Re: [Bloat] Goodput fraction w/ AQM vs bufferbloat
On May 6, 2011, at 8:14 AM, richard wrote:
If every packet takes two attempts then the ratio will be 1/2 - 1
me of data, but where the
goodput fraction is at least a similar percentage points better... I.e. by
properly tuning their AQM schemes.
Best regards,
Richard
- Original Message -
From: "richard"
To: "Fred Baker"
Cc:
Sent: Friday, May 06, 2011 5:14 PM
Subject:
ivated by other, typically much less strong
incentives).
Best regards,
Richard
- Original Message -
From: "Fred Baker"
To: "Jim Gettys"
Cc:
Sent: Friday, May 06, 2011 6:18 AM
Subject: Re: [Bloat] Goodput fraction w/ AQM vs bufferbloat
There are a couple of ways t
Hi, I suggest you look at the following paper for a more
general version of this formula (equation 3), which includes the
effect of limited capacity and/or limited receive-window:
http://www.cc.gatech.edu/fac/Constantinos.Dovrolis/Papers/f235-he.pdf
The paper also discusses common mistakes when t
On Sat, 7 May 2011 19:39:22 +0300
Jonathan Morton wrote:
>
> On 7 May, 2011, at 1:10 am, Stephen Hemminger wrote:
>
> > Rate <= (MSS/RTT)*(1 / sqrt{p})
> >
> > where:
> > Rate: is the TCP transfer rate or throughputd
> > MSS: is the maximum segment size (fixed for each Internet path, typically
On 7 May, 2011, at 1:10 am, Stephen Hemminger wrote:
> Rate <= (MSS/RTT)*(1 / sqrt{p})
>
> where:
> Rate: is the TCP transfer rate or throughputd
> MSS: is the maximum segment size (fixed for each Internet path, typically
> 1460 bytes)
> RTT: is the round trip time (as measured by TCP)
> p: is
On Fri, 6 May 2011 14:56:01 -0700
Fred Baker wrote:
>
> On May 6, 2011, at 8:14 AM, richard wrote:
> > If every packet takes two attempts then the ratio will be 1/2 - 1 unit
> > of googput for two units of throughput (at least up to the choke-point).
> > This is worst-case, so the ratio is likel
On May 6, 2011, at 8:14 AM, richard wrote:
> If every packet takes two attempts then the ratio will be 1/2 - 1 unit
> of googput for two units of throughput (at least up to the choke-point).
> This is worst-case, so the ratio is likely to be something better than
> that 3/4, 5/6, 99/100 ???
I ha
I'm wondering if we should look at the ratio of throughput to goodput
instead of the absolute numbers.
Yes, the goodput will be 100% but at what cost in actual throughput? And
at what cost in total bandwidth?
If every packet takes two attempts then the ratio will be 1/2 - 1 unit
of googput for tw
There are a couple of ways to approach this, and they depend on your network
model.
In general, if you assume that there is one bottleneck, losses occur in the
queue at the bottleneck, and are each retransmitted exactly once (not
necessary, but helps), goodput should approximate 100% regardless
On 05/05/2011 12:10 PM, Stephen Hemminger wrote:
On Thu, 05 May 2011 12:01:22 -0400
Jim Gettys wrote:
On 04/30/2011 03:18 PM, Richard Scheffenegger wrote:
I'm curious, has anyone done some simulations to check if the
following qualitative statement holds true, and if, what the
quantitative ef
On Thu, 05 May 2011 12:01:22 -0400
Jim Gettys wrote:
> On 04/30/2011 03:18 PM, Richard Scheffenegger wrote:
> > I'm curious, has anyone done some simulations to check if the
> > following qualitative statement holds true, and if, what the
> > quantitative effect is:
> >
> > With bufferbloat, th
On 04/30/2011 03:18 PM, Richard Scheffenegger wrote:
I'm curious, has anyone done some simulations to check if the
following qualitative statement holds true, and if, what the
quantitative effect is:
With bufferbloat, the TCP congestion control reaction is unduely
delayed. When it finally hap
I'm curious, has anyone done some simulations to check if the following
qualitative statement holds true, and if, what the quantitative effect is:
With bufferbloat, the TCP congestion control reaction is unduely delayed.
When it finally happens, the tcp stream is likely facing a "burst loss"
e
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