Re: [lwip-users] lwip140 Tx performance is lower than lwip130 performance

[Anirudha Sarangi]

Hi,

I was doing a stress test on lwip today and it failed.

I am in RAW mode.

I did the following:

I downloaded the lwip140 based application on my board.

Connected a PC back-to-back to my board.

Opened around 30 ping connections on my host PC. So from 30 different ping connections I started pinging the board. I got ping replies on all of them.

Then I opened an iperf client on my host PC. I have a small application that runs on the lwip140 stack to take care of this iperf client. The iperf on the host PC shows that it is connected. But after that everything just hung up. I do not get any more ping replies and iperf also does not work.

 

So it seems the lwip stack just hung up. 

Is there any limitation in the stack for this kind of test?

 

I am sure my iperf application does not have issues as I have been using it without any issues since years. It is just that when I have so many ping requests running simultaneously, the iperf just crashes the stack.

When I stopped the application, I see the control somewhere inside tcp_write.

 

Any configuration is wrong? Any suggestions how to get around this issue?

 

regards

Anirudha

 

 

 

 

From: Anirudha Sarangi <address@hidden>
To: Mailing list for lwIP users <address@hidden>
Sent: Sunday, 30 October 2011 1:22 PM
Subject: [lwip-users] lwip140 Tx performance is lower than lwip130 performance

Hi,

Continuing the earlier discussion, lwip140 performance has improved a lot on the Rx side in comparsion to lwip130/lwip132.

But, lwip140 Tx side performance has dropped.

 

This is for RAW API mode.

I use microblaze (from Xilinx) and run iperf to measure the performance. I have done any changes in lwip140 or lwip130 for my tests. Also the driver interface is exactly same for both.

Regarding the numbers, for lwip130, if I get around 100 Mbps, for lwip140 I get around 87-90 Mbps. So there is a big drop.

Actually, if I use the same lwipopts.h for both, then the drop is even more. If lwip130 gives 100Mbps, lwip140 gives around 65-70 Mbps. After playing around with the configuration, I could increase from 65-70 Mbps to 87-90 Mbps. But beyond that I am unable to go.

 

The lwipopts.h for both and opt.h for both are attached.

 

regards

Anirudha

 

From: "address@hidden" <address@hidden>
To: Mailing list for lwIP users <address@hidden>
Sent: Friday, 30 September 2011 12:37 AM
Subject: Re: [lwip-users] Fw: (no subject)

FreeRTOS Info wrote:
> Could you please provide details of what you changed.
Good idea, could you please provide your lwipopts.h for both versions?
Maybe we can see anything from that. I'd like to measure performance on
my hardware using these 2 versions + configs.

Also, which API are you using? Sockets, netconn or raw API?

Simon

>
>
> Regards,
> Richard.
>
> + http://www.FreeRTOS.org
> Designed for Microcontrollers.
> More than 7000 downloads per month.
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>
>
> On 29/09/2011 07:29, Anirudha Sarangi wrote:
>> Hi Kieran,
>> I was playing with some of the new parameters that are added in lwip140.
>> I got good improvement in numbers.
>> The numbers improved from around 66 MB to 82 MB.
>>
>> With the same hardware and same application files (compiler options are
>> also same), lwip130 gives me a number of 92-93 MB for txperf and lwip140
>> gives me a number of 82 MB. There is still a difference of 10 MB.
>>
>> I want to send you the pcap files for both. Old as well as new lwip. But
>> not sure how. The pcap files are quite large.
>>
>> Is there anyway I could send them to you? Alternate mail id or something?
>>
>> regards
>> Anirudha
>>
>> *From:* Kieran Mansley<address@hidden>
>> *To:* Mailing list for lwIP users<address@hidden>
>> *Sent:* Wednesday, 28 September 2011 5:04 PM
>> *Subject:* Re: [lwip-users] Fw: (no subject)
>>
>>
>> On 28 Sep 2011, at 12:15, Anirudha Sarangi wrote:
>>
>>> Hi Kieren,
>>> Do you mean capturing the packets in wireshark and sending you the log?
>> Exactly.  Please send the pcap file, not just the textual log.
>>
>> Kieran
>>
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