Cisco 851 Throughput Question in Cisco http://www.dslreports.com/forum/r20802440 en Sun, 06 Dec 2009 13:37:43 EDT Sun, 06 Dec 2009 13:37:43 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20958656 anon : I even tried running the 871 IOS on an 851 and the first and only error msg was something about a cpu mismatch.]]> http://www.dslreports.com/forum/remark,20958656 Sat, 16 Aug 2008 00:55:41 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20957090 rhard49 : I just opened the 851 cablevision gives you Same MC8272 processor marked 266/200/66Mhz same altera chipset.

I use an 871w with a fios 20/20 connection. I have switched my plans several times started with 20/5 went to 35/10 finally settled out 20/20 as the best for my needs the 871 has worked perfectly at all speeds.]]> http://www.dslreports.com/forum/remark,20957090 Fri, 15 Aug 2008 18:29:24 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20956814 kamikatze :

CPU specs: »www.freescale.com/webapp/sps/sit···bTdG2977

quote:
Delivering an ideal combination of price, performance and low-power operation, the MPC8272 Family supports CPU frequencies ranging from 266 MHz to 400 MHz while offering the benefits of low power consumption (0.8 W at 266 MHz).


If you open up a 870 you'll see 266MHz printed on the CPU.
I don't have a 850 here but that CPU doesn't go any slower.
Maybe the ALTERA chip is different.
The 870 has an EPM3128ATC144-7N.
»www.altera.com/cgi-bin/devsearch···=EPM3128

Can anyone look inside the 850?]]> http://www.dslreports.com/forum/remark,20956814 Fri, 15 Aug 2008 17:29:36 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20956755 PA23 : 871 is 2 1/2 times faster than the 851

25,000 PP/s vs 10,000 PP/s

see: »www.cisco.com/web/partners/downl···ance.pdf (which has already been posted)
--
It's the end of the world as we know it, and I feel fine]]> http://www.dslreports.com/forum/remark,20956755 Fri, 15 Aug 2008 17:14:12 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20956011 Phraxos :
said by kamikatze See Profile :

Considering the 851 has the same CPU only half the memory, i'd say it will pretty much do the same.
Not sure where you got the processor info from?! I'll bet that an 851 with extra memory comes nowhere close to an 871 performance wise.

I would go for at least an 871 for a 30Mb service especially considering the price difference.

Cisco stuff is much better made and much more sophisticated/versatile but if you just want a simple cheap router that will do the job 98% of the time don't buy a Cisco router, you will be wasting your money.]]> http://www.dslreports.com/forum/remark,20956011 Fri, 15 Aug 2008 14:45:05 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20955897 kamikatze : I'll give you a reason.
Take the DIR-855, D-link's flagship or something.

»www.smallnetbuilder.com/myinclud···oard.jpg

That's actually how the heatsink is glued on. And when i say
glued on i mean GLUE, not thermal adhesive or some other sci-fi chemical.

Then pop open a Cisco..]]> http://www.dslreports.com/forum/remark,20955897 Fri, 15 Aug 2008 14:18:59 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20955342 nltech : The point of that last link was to say would I be better served with one of these other routers to get the higher throughput? I am reading these stats wrong in comparing the 851 to these other routers.

Trying to figure what is the real benefit in spending the extra money for the Cisco compared to these other routers-firewalls.]]> http://www.dslreports.com/forum/remark,20955342 Fri, 15 Aug 2008 12:27:06 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20954723 PA23 : so my estimated numbers were pretty close huh, I said about 26 Mb/s and you get 24Mb/s.
--
It's the end of the world as we know it, and I feel fine]]> http://www.dslreports.com/forum/remark,20954723 Fri, 15 Aug 2008 10:12:17 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20954649 kamikatze : If it helps, i have a Cisco 871 at home, doing PPPoE, nothing else. Bittorrent-wise it goes up to 26Mbps (~3.3MB/s). Nothing higher. Considering the 851 has the same CPU only half the memory, i'd say it will pretty much do the same.]]> http://www.dslreports.com/forum/remark,20954649 Fri, 15 Aug 2008 09:58:47 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20954574 nltech : Still considering the 851 but after seeing this throughput comparision still a bit confused. These tests use iperf with a TCP window size of 16.0 kBytes

»www.smallnetbuilder.com/componen···art,119/]]> http://www.dslreports.com/forum/remark,20954574 Fri, 15 Aug 2008 09:42:02 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20805017 zinjin : Hello,
I use a Cisco 851 (current IOS 12.4(15)T6) at home, and have been very pleased with its performance. My old Netgear 318 FVG didn't even come close to the performance of this Cisco 851 and can say for sure that it will exceed the 5mbps on download.

You will be very happy getting a Cisco 851.]]> http://www.dslreports.com/forum/remark,20805017 Thu, 17 Jul 2008 09:49:18 EDT Re: Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20804496 PA23 : Take a closerer look at how cisco comes up with the value of 5Mb/s its using an absolute worst case scenario for throughput.

cisco rates their products in PP/s (Packets Per second) so it stands to reason that a smaller packet can not pass as much data.

If you calculate the throughput with a 1500 byte packet using cisco's formula at the top of the document you get:

10000 (PP/s) * 8 (bits per byte) * 1500 = 120,000,000 or 120Mb/s or faster than the interfaces on the unit

I think I read some place that an average packet size on the internet is roughly 300 bytes. If this is true then you can expect the following performance:

10000 (PP/s) * 8 * 300 = 24,000,000 or 24Mb/s

What you will find however is it is not your router becoming the bottleneck, instead you'll find that your bottleneck will be the host or hosts you are talking to.

In addition, I think you will be very hard pressed to find a consumer router that has the performance of the 851 since all of them have the same limitation in terms for forwarding rate in PP/s. Any router that shows its throughput numbers you can be sure was tested with 1500 byte packets. You can prove it to yourself, use ttcp between two machines and vary the packet size as you get smaller the throughput will go down.

Hope that clears up cisco's throughput ratings.
--
It's the end of the world as we know it, and I feel fine]]> http://www.dslreports.com/forum/remark,20804496 Thu, 17 Jul 2008 06:59:00 EDT Cisco 851 Throughput Question http://www.dslreports.com/forum/remark,20802440 nltech : For Cablevision Optimum Boost 30mbps down / 5mbps up service level, DSL reports recommends the Cisco 851 in this FAQ »Optimum Online FAQ »What Routers are Compatible with OOL's 15/2 and 30/5 (BOOST) Plans?

But what I do not understand is the throughput Cisco lists for the router is only 5mbps in this FAQ.
»www.cisco.com/web/partners/downl···ance.pdf

Is there something I am misunderstanding here or is the 851 just not capable of the higher download speeds?

btw - that router is also the same one Cablevision provides so I think it is capable but maybe I missing something here.]]> http://www.dslreports.com/forum/remark,20802440 Wed, 16 Jul 2008 19:43:13 EDT