[e2e] TCP Performance with Traffic Policing

[Alex Moura]

On Fri, Aug 12, 2011 at 12:48, rick jones <perfgeek at mac.com> wrote:

>
> On Aug 12, 2011, at 7:03 AM, Barry Constantine wrote:
>
> > Hi,
> >
> > I did some testing to compare various TCP stack behaviors in the midst of
> traffic policing.
> >
> > It is common practice for a network provider to police traffic to a
> subscriber level agreement (SLA).
> >
> > In the iperf testing I conducted, the following set-up was used:
> >
> > Client -> Delay (50ms RTT) -> Cisco (with 10M Policing) -> Server
> >
> > The delay was induced using hardware base commercial gear.
> >
> > 50 msec RTT and bottleneck bandwidth = 10 Mbps, so BDP was 62,000 bytes.
> >
> > Ran Linux, Windows XP, and Windows 7 clients at 32k, 64k, 128k window
> (knowing that policing would
> > kick in at 64K)
> >
> >                Throughput for Window (Mbps)
> >
> > Platform        32K        64K        128K
> > --------------------------------------------
> > Linux          4.9         7.5         3.8
> > XP             5.8         6.6         5.2
> > Win7           5.3         3.4         0.44
> >
>
> The folks in tcpm might be better able to help? but I'll point-out one nit
> - "Linux" is not that much more specific than saying "Unix" - it would be
> goodness to get into the habit of including the kernel version.  And ID the
> server since it takes two to TCP...
>

BTW, including latest FreeBSD (or some other BSD) and Mac OS X might give
interesting - maybe useful - values for the work.

Alex
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