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From: Nobody on 29 Dec 2009 12:10
On Sun, 27 Dec 2009 03:24:29 -0800, Bob wrote:

> For disk drives the magnetic recording medium is linear, so the block
> size and cylinder/head/sector addressing can be arbitrary and not
> based on powers of 2. For convenience, the sector size is chosen to be
> a power of 2 to match how memory is arranged. Whether the overall
> storage size of a disk is quoted in SI or K is down to preference, but
> the manufacturers prefer the standard SI units.

Except for floppy drives, where they split the difference and use
1024*1000-byte megabytes (e.g. 1.44MB = 1440 * 1024 bytes).

From: dold on 1 Jan 2010 17:49
In alt.internet.wireless alexd <troffasky(a)hotmail.com> wrote:

> On second thoughts, two different types of iperf floating around the
> internet could lead to much confusion when trying to compare speed test
> results.

I have enough trouble keeping people straight in conversation about the
difference between MegaBytes and Megabits that the difference between 1024
and 1000 gets lost in the noise.

I have a nicely prepared document from a large firm last month that used MB
throughout, and by knowing some of the background, I could tell that some
were Megabits, and others MegaBytes, within the same page of text.

On all of the iperf tests, it would have been wise to specify the -f
format, since the performance of my network, just to add to the misery,
was often 1/10th of the speed of nominal, and the iperf output default
would fluctuate, making careful attention to the labels important.
That was occasionally overlooked.

--
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5
From: dold on 1 Jan 2010 17:55
In alt.internet.wireless Jeff Liebermann <jeffl(a)cruzio.com> wrote:
> For some entertainment value, try TTCP:
> <http://www.pcausa.com/Utilities/pcattcp.htm>
> and see how the results compare.

One of my customers used something called BRICKS, a GUI thing that was
proprietary to some networking company.

It defaulted to UDP, leading to some performance numbers that the customer
wanted to see matched by the production data which was running TCP.

--
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5
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