[Soekris] Wimax and SBC's

[tommy@bishoptower.com]

Hi Bao,

Well I did get one little tip today thay may prove helpfull... I was not 
aware that the Prism based wireless cards (which we are using) are taxing 
the cpu because they have polling I/O rather than DMA. The new Atheros based 
cards are DMA, so it looks like it is time to upgrade the card and retest.

My experience with QNX was favorable, ran it on an old 486 I had laying 
around, but was disappointed in the available apps for it at the time. Of 
course, I miss OS2 also but thats another story altogether...

Tom Johnson
802DSL.COM

----- Original Message ----- 
From: "Bao C. Ha" <bao at hacom.net>
To: <soekris-tech at lists.soekris.com>
Sent: Sunday, November 07, 2004 9:08 PM
Subject: Re: [Soekris] Wimax and SBC's


> Hi Tom,
>
> On Sun, November 7, 2004 5:09 pm, tommy at bishoptower.com said:
> ...
>> What do mean you don't understand the OP's question?!?!  ;)
>
> I think he meant that you need something like to a P4 running at 2+
> Ghz. I don't think you need that much horse power, to push some
> 40-70 Mbps. WiMax maxes out at 70Mbps. I believe a pico base
> station can only handles 10 connections, 70Mbps/ea, with a 100Mbps
> Ethernet backend. But, they keep changing the story on WiMax,
> probably until a "true" compliant and certified 802.16a device has
> arrived.
>
>> So do you also feel that the current OS offerings are the handicap to
>> seeing
>> the full potential of faster wireless technology, not the horsepower of
>> the
>> board itself? Your argument about the Cisco is a valid one, and another
>> responder also says RTOS is the key, not a faster board. I played with 
>> QNX
>> for months and thought it was a pretty good, so perhaps an OS based on it
>> rather than linux or BSD is the key to more efficiency to see the
>> throughputs the radio cards are capable of?
>
> Qnx? Give me a break! In 2000-2001, when we were developing an
> embedded automotive application, we made a mistake choosing
> Qnx. We were much happier to go back to Linux, running on a
> Hitachi SH4 processor. It may be just a bad experience! :-((
>
> Linux runs from a lowly ColdFire (without MMU neither FPU), to the
> mighty S/390. You can still do a lot to optimize Linux to run on a
> low-end application specific machine like a Soekris 4521. If you
> have done somthing similar to the uCLinux crowd or even the
> Emdebsys/Emdebian, and still not gotten a satisfactory
> performance, then a hand-crafted scheduler is the only answer.
> No other OSes, including VxWare, eCOS, Qnx, or a RTOS, ... will
> be able to wring a better performance out of the hardware.
>
> Bao
> -- 
> Best Regards.
> Bao C. Ha
> Hacom OpenBrick Distributor USA http://www.hacom.net
> voice: (714) 530-8817 fax: (714) 530-8818
> 8D66 6672 7A9B 6879 85CD 42E0 9F6C 7908 ED95 6B38
>
>
> _______________________________________________
> Soekris-tech mailing list
> Soekris-tech at lists.soekris.com
> http://lists.soekris.com/mailman/listinfo/soekris-tech
>