[lwip-users] LWIP Delay between Consecutive Packets

[Gary Olson]

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Hi Kieran,

  Actually I am in trouble in my Xilinx Design since my bandwidth is not
good enough to handle the data rates required.
According to the PC Timing information.  I get a bandwidth of about 7.0
Megabytes per second on a Gigabit Interface.
Or 56.5 Megabits per second.

Now each individual packet I send is 4040 bytes and can be sent in around 14
- 16 us by the PC.  But the Time between each packet
Is approx 500 us.  If I can figure out how to shorten this time I may
improve my bandwidth.  I need to 
double my bandwidth to about 14 Megabytes per second be successfull with
this design.  My requirement is about 6 Picture frames 
a second and at about 7 Megabytes I can probably get 3 Frames per second.

Gary



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Today's Topics:

   1. Re: LWIP Delay between Consecutive Packets (Kieran Mansley)


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Message: 1
Date: Tue, 30 Sep 2008 16:13:11 +0100
From: Kieran Mansley <address@hidden>
Subject: Re: [lwip-users] LWIP Delay between Consecutive Packets
To: Mailing list for lwIP users <address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain

On Tue, 2008-09-30 at 11:00 -0400, Gary Olson wrote:
> I am trying to figure out if I can increase my TCP bandwidth.  Using a
PC timer
> I see that as I send TCP Packets that the delay is in the range of 500
us on
> average.

If you have a delay in the order of hundreds of microseconds, the
delayed ACK timer is not something to worry about as delays from that
are measured in hundreds of milliseconds.

Kieran





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