ISP speed

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ISP speed

Postby pf » Fri, 08 Jan 2010 07:28:01 GMT

I am out in the boonies of Costa Rica.  I managed to get internet via
tower broadcast.  It is not very good but the only store in town.  There
are no telephone lines where I live.  Most people use cell phones.  

Anyway, my question is about the ISP speed.  My provider uses
speedtest.net to test the speed it is providing because it is
international iand is testing me, In theory, from a ISP in Costa Rica,
less than 50 miles away.

So my question is this.  My last test gave me:
ping:  254 ms
download: 0.57 Mb/s
upload:      0.20 Mb/s

When I download a file from a USA site in Safari, I am getting speeds
against this reading of about 25 kBytes per sec.  Now, by the rule of 8,
that works out to about 0.20kbps.  So what's wrong with this picture?

-- 
During times of universal deceit, telling the truth 
becomes a revolutionary act.
George Orwell

Re: ISP speed

Postby Ian Gregory » Fri, 08 Jan 2010 09:44:04 GMT




I think of it as a rule of 10. Yes there are 8 bits in a byte but I 
figure there is also protocol overhead. If there is any packet loss   
some packets will have to be delivered twice, adding to that overhead. I 
would be surpried if what you are seeing is unusual.

How consistent is the 25 kBytes per sec figure? How often have you 
measured it and was it at varying times of day etc?

Ian

-- 
Ian Gregory
 http://www.**--****.com/ 

Re: ISP speed

Postby Wes Groleau » Fri, 08 Jan 2010 13:19:12 GMT



Eight bits, plus a synchronizing bit at each end.

-- 
Wes Groleau

   Fossilization  to teachers.
    http://www.**--****.com/ 

Re: ISP speed

Postby nospam » Fri, 08 Jan 2010 13:34:41 GMT






That's for serial protocols (i.e. dialup). The overhead for TCP/IP is
usually much lower. Well, it can be much higher for things like
interactive stuff where you might actually often send a packet with only
one data byte, but then throughput isn't typically the most important
spec for that kind of application.

I recall being pleasantly surprised at my first "broadband" connection
(a 128k IDSL line, as I was and still am too far from the CO for
"regular" DSL, though I'm using cable instead now). I measured the
throughput and got what seemed to me like better than the advertized
speed. Then I realized that I had been dividing by 10 out of habit from
serial connections, but that 8 was more appropriate for TCP/IP. (Sure,
it isn't exactly 8, as there is some overhead, but close enough). When I
used 8, I found it was pretty much right on the advertized speed.

-- 
Richard Maine                    | Good judgment comes from experience;
email: last name at domain . net | experience comes from bad judgment.
domain: summertriangle           |  -- Mark Twain

Re: ISP speed

Postby Wes Groleau » Fri, 08 Jan 2010 13:59:04 GMT





IP is at a higher level than the start/stop bits.
TCP is higher still.

DSL, Verizon FIOS, Cable, and ethernet do use serial protocols.
However, I reckon you're right that they don't need a synchronizing
bit on every octet.


Mine seems to keep bytes per second about a tenth of bits per second.

-- 
Wes Groleau

   Standards?a parable
    http://www.**--****.com/ 

Re: ISP speed

Postby E Z Peaces » Fri, 08 Jan 2010 16:25:45 GMT



I don't know if it's related, but the other day I tried BitTorrent to 
download NeoOffice.  The file came in at a much slower speed than the 
network traffic shown in Activity Monitor.  I've also heard that files 
download more slowly if you use a proxy server.

Re: ISP speed

Postby pf » Sat, 09 Jan 2010 00:25:01 GMT




It will vary.  Lately it will not go over 40 and falls down into the
{*filter*}s quite often.  But 25 is a typical average.  It  tends to be slower
in the evening, presumably because higher usage is clogging the system.

Speedtest also gives me a ping number, and this varies tremendously.  I
have seen it run from 40 ms to 1300ms.  The Safari page load speeds seem
to be more related to the ping speed than variations in the download
speed.  This morning the system seemed quite spiffy, and when I checked
it, the download was typical but the ping was 51, which is about as fast
as it gets.

I also suspect that the slow upload speeds slow the system a lot because
it has to wait longer for the error checking.  Typical download is 500
kbps and upload 100.  Could this be a major reason why the file download
speed, even using the rule of ten, seems a lot slower than the speedtest
download?  The rule of ten should give me at least 50 kBytes/s and I
never get close to this.

-- 
During times of universal deceit, telling the truth 
becomes a revolutionary act.
George Orwell

Re: ISP speed

Postby Kevin McMurtrie » Sat, 09 Jan 2010 14:01:04 GMT

In article <1jbwny6.1v1acrl1rbxra7N%pf@porkain'tkosher.oink>,




It could be that you're suffering from packet loss due to malfunctioning 
equipment or heavily loaded networks sending traffic to you in bursts.

Try pinging a site as you're downloading.  For Mac OS 10.5 and earlier, 
packet loss has an extremely high performance penalty on high latency 
connections.  Every lost packet causes the stream in progress to be 
discarded, repositioned, and then resumed.  That takes a while when 
there's 1/4 second of lag.  Mac OS 10.6 finally implements "Selective 
ACKs" which allows lost packets to be resent without interrupting the 
stream in progress.
-- 
I won't see Google Groups replies because I must filter them as spam

Re: ISP speed

Postby Jean-Michel LEON-FOUN-LIN » Tue, 12 Jan 2010 01:31:45 GMT

On 2010-01-07 02:28:01 +0400, Paul Fuchs said:


Is it not 0.2 MEGA bits per second (not 0.2 KILO bits per sec.)?


Re: ISP speed

Postby pf » Tue, 12 Jan 2010 22:20:10 GMT




Yes, it should have read 0.2 Mbps.  I didn't correct it with a follow
post, because the error was obvious from the other information.

-- 
During times of universal deceit, telling the truth 
becomes a revolutionary act.
George Orwell

Similar Threads:

1.hi-speed usb device attached to non-Hi-Speed hub error connectingIPod to T40

"Doug Ellice" < XXXX@XXXXX.COM > wrote in message
news: XXXX@XXXXX.COM ...
> n0sferatu wrote:
> > When I connect my IPod (latest gen) to my Thinkpad T40 (which I KNOW has
> > USB2.0 ports) (running Win 2003), I get the above message.
> >
> > When I look at Device Manager and list connections by type, I see many
USB
> > Hubs, and one USB Enhanced 2.0 Hub; the IPod is connected to one of the
> > other ones.
>
>
> I think this might be Windows lying to us.
>
> I have a similar problem.  I connected a no-name powered USB hub to my
> Dell desktop.  I constantly get pop-up messages announcing that this
> USB-2 device would work faster if it were connected to a high-speed port.
>
> My computer doesn't have any USB-1 ports, I don't think.
>

Yes it does.

> When I click on the pop-up balloon, as invited, for more info, I also
> see a chart listing many USB ports.  Like yours, only one of my 8 is
> listed as high-speed.
>

The OHCI (USB1) ports are listed first (usually 2 ports to a root hub)

The EHCI (USB 2) port is the last one (usually as many ports as all the
above together.)

> I'm convinced this is a Windows XP problem of some sort, and I ignore it.
>
> Does your iPod work O.K. when you connect it, despite the pop-up "error"
> message?
>

Is this no-name hub of which you speak a true USB2 hub?  Unfortunately,
because the USB2 specification contains an ambiguity, hub, peripheral and
motherboard manufacturers are able to sell devices as USB2 devices but that
do not support the 480 Mbps high speed mode.

Some devices are occasionally encountered which require a USB2 specific
driver to be loaded otherwise they default to USB1.  I have no knowledge if
the iPod is one of these devices.

This effect can also be seen if the USB cable that you use is not up to
performing at USB2 speeds (or is too long).  This could also be true of a
true USB2 hub that has marginal performance.  If the data is sufficiently
corrupt, the USB system down trains to USB1 speeds.

I have also encountered the occasional device that works in one port, but
not in another.  Try plugging into a different port.

HTH

Ian.



2.hi-speed usb device attached to non-Hi-Speed hub error connecting IPod to T40

Hi

When I connect my IPod (latest gen) to my Thinkpad T40 (which I KNOW
has
USB2.0 ports) (running Win 2003), I get the above message.

When I look at Device Manager and list connections by type, I see many
USB
Hubs, and one USB Enhanced 2.0 Hub; the IPod is connected to one of the

other ones.

When I called IBM, they had me install a chipset driver. That didn't do

anything.

Then I uninstalled all the hubs other than the USB2.0, and my IPod
showed
up on USB2.0 on the next connect, but my external mouse (which also is
on
one of the other hubs) disappeared.

My questions:
1. How can I make my IPod always show up on the USB2.0 hub?
2. If this laptop's ports are supposed to be USB2.0, why would devices
show up on some USB1.1 hub anyway?


HH

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