[En-Nut-Discussion] Heave load will harm the system?

Tue Feb 28 22:17:43 CET 2006

Just back from to office, i just want to update the report, the system just 
hang not burnning :p,
I believe should be my software flaw, however when i do the test again, it 
seem notthing wrong, no hang, no traffic drop.
everything seem fine, this maybe rare case happen once a year, anyway this 
is my latest test
http://img371.imageshack.us/img371/6876/trafficcr7ur.jpg
http://img379.imageshack.us/img379/4971/traffic2cr4nc.jpg
this test seem it able to handle up to 20 concurrent user, (however only 4 
httpd been set)
i believe last time the system hang cause by a suddent memory drop, and not 
able to recover from that drop,
however when i redo the test, it seem everything just fine.

WFLOH

----- Original Message ----- 
From: "ivesworking" <ivesworking at hotmail.com>
To: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
Sent: Tuesday, February 28, 2006 8:33 PM
Subject: Re: [En-Nut-Discussion] Heave load will harm the system?

> the quesion still go back to the original point, as u say atmega128 will 
> still run at idle, my question is if the whole MCU are processing without 
> idle thread.
> for my case, i run xml phrasing when a http request been send from the pc, 
> i using some http test tools to load the mcu.
> i was infront the development board when i do the 1min load test, and i 
> feel a bit warm the normal after i do the load test,
> i was continue doing the test after i left the office using remote 
> desktop, the test is the same, but this time i load the MCU a bit longer, 
> 7 min,
> it work fine on the first 3 min, the suddenly all the traffic drop to 0, i 
> am not sure about the mcu burn out or just a system hang because i still 
> remote controlling my pc,
> i will report later see is a system hang or the worse case.
> idle case and the load case, the mcu temperature is different.
>
>
> WFLOH
> PS: i like side track question.
>
> below are some of my test result using cgi which need little processing 
> speed, maybe some one will interested
> Receiving speed (kbits/sec)
>
>      Profile
>     0:00:00- 0:00:10
>     0:00:10- 0:00:20
>     0:00:20- 0:00:30
>     0:00:30- 0:00:40
>     0:00:40- 0:00:50
>     0:00:50- 0:01:00
>     Total
>
>      20connection
>     130
>     201
>     237
>     184
>     152
>     175
>     180
>
>      4connection
>     252
>     206
>     245
>     272
>     264
>     242
>     247
>
>      2connection
>     307
>     276
>     305
>     259
>     306
>     285
>     289
>
>
>
>
> Response time, sec
>
>      Name
>     Time
>     0:00:00- 0:00:10
>     0:00:10- 0:00:20
>     0:00:20- 0:00:30
>     0:00:30- 0:00:40
>     0:00:40- 0:00:50
>     0:00:50- 0:01:00
>
>      20connection
>     Min
>     0.02
>     0.02
>     0.02
>     0.02
>     0.02
>     0.02
>
>      4connection
>     Min
>     0.02
>     0.02
>     0.02
>     0.02
>     0.02
>     0.02
>
>      2connection
>     Min
>     0.02
>     0.02
>     0.02
>     0.02
>     0.02
>     0.02
>
>      20connection
>     Avg
>     0.2
>     0.19
>     0.2
>     0.25
>     0.29
>     0.26
>
>      4connection
>     Avg
>     0.15
>     0.2
>     0.2
>     0.14
>     0.16
>     0.17
>
>      2connection
>     Avg
>     0.06
>     0.07
>     0.07
>     0.08
>     0.07
>     0.08
>
>      20connection
>     Avg90
>     0.9
>     0.91
>     0.96
>     1.08
>     1.13
>     1.03
>
>      4connection
>     Avg90
>     0.85
>     0.98
>     1.1
>     0.77
>     0.82
>     1.08
>
>      2connection
>     Avg90
>     0.29
>     0.36
>     0.34
>     0.44
>     0.42
>     0.45
>
>      20connection
>     Max
>     3.05
>     4.08
>     4.03
>     4.04
>     3.03
>     3.2
>
>      4connection
>     Max
>     5.05
>     4.0
>     6.98
>     3.08
>     4.06
>     5.99
>
>      2connection
>     Max
>     2.11
>     2.08
>     2.03
>     2.84
>     3.1
>     3.04
>
>
>
> this is all program generate
>
> ----- Original Message ----- 
> From: "Harald Kipp" <harald.kipp at egnite.de>
> To: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
> Sent: Tuesday, February 28, 2006 7:38 PM
> Subject: Re: [En-Nut-Discussion] Heave load will harm the system?
>
>
>>
>> At 13:12 28.02.2006 +0000, you wrote:
>>>running a webserver on the atmega128, and i use performance tools to load 
>>>the system, if i continue load the server, will the mcu burn for 
>>>overheat? anyone have experience on this?
>>
>> The ATmega128 is running full speed all the time. If all
>> threads are waiting for an event, the idle thread will
>> run. This can last for years without problem or any
>> heating up.
>>
>> The Ethernet Controller is a different story, as the
>> PHY part contains an analog power circuit. It may heat
>> up a bit during heavy Ethernet traffic. But there is
>> no danger of overheating of the 10 MBit Controller used
>> on Ethernut 1. The 100 Mbit Controller on Ethernut 2
>> becomes really warm, even in idle state. The Controller
>> on Ethernut 3 shows, that this is not mandantory for all
>> 100 MBit PHYs. It stays relatively cool.
>>
>> Harald
>>
>> P.S. I liked this question. Wonder why it hadn't been asked
>> before.
>>
>>
>> _______________________________________________
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>>
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