I checked before, and caught no error
When payloadsize=400, Wireshark shows the ACK from PC to the last packet
from lwIP, and lwIP simply stops there
When payloadsize=1000, the packet frequency is much much slower than the
smaller payload
>>>>
Can you check that lwip_send is not returning an error? The value
returned by lwip_send will either be the size sent if l > 0, or an error
if l < 0. This could explain why things go badly wrong for you.
Kieran
>>>>
Sorry, forgot to include the result:
payloadsize=100, about 6 seconds
Payloadsize=200, about 3 seconds
payloadsize=400, never finish
payloadsize=500, never finish
payloadsize=1000, 3 minutes
payloadsize=2048, over 3 minutes
>>>>>>>>>>>
Just a tight loop after the connection:
char dummy_data[2048];
total=10000000;
count=0;
do{
l=lwip_send(clientfd, dummy_data, payloadsize, 0);
count =count+l;
}while (count<total)
Just try different payloadsize, for example, 100, 500, 1000, 1500, 2000,
and you should see the result.
From: Francois Bouchard
Subject: Re: [lwip-users] Re: lwip-users Digest, Vol 67, Issue 6
Date: Tue, 3 Mar 2009 14:59:43 -0500
Weird,
How long for a payload of... let's say 1400 bytes?
How do you measure/calculate the Bandwidth?
>>>>>>>>>>>>
The TCP's tx bandwidth is greatly affected by the size of payload for
lwip_send.
My test is to send out 1000000 bytes of data as fast as possible (via TCP
connection, such as telnet)
If payload is 100 bytes, it takes only a few seconds to send out all the
data. If the payload is 2048, it takes a loooooooooooong time
Any comment?
Subject: Re: [lwip-users] Re: lwip-users Digest, Vol 67, Issue 5
To: Mailing list for lwIP users <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain
On Tue, 2009-03-03 at 09:05 -0500, Chen wrote:
> 2) When I lwip_send too much data, the program actually crashes --- I
> will investigate more on the cause
Thanks for investigating - it should work fine. More details of what
goes wrong, and what you do to cause it to go wrong would help.
Kieran
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