Dear Thomas,
Now I am also fighting against improving the performance of the TEMAC on
ml403 board. But the difference is I work on the old plb_temac and
hard_temac cores and my linux is 2.6.
I used some little programs written by myself to test the throughput of the
network between a pc and my board. (I would like to say, I am not an
experienced programmer so I cannot make sure my programs have no problem,
although they are simple. :-) ) According to my result, the largest
throughput between my board and a pc is around 4MB/s, for a round-trip.
However when those programs applied on two servers interconnected by
gigabit ethernet, the largest throughput is around 12MB/s, three times than
my board.
I have not used the popular software, such as Netperf, to measure my little
network.
I also noticed that when transfering the data, the CPU utilization is very
high(almost 100%). I am not sure if this is the reason. I think because
there is SGDMA who can deal with data transfer, the CPU utilization should
not be so high.
I am also waiting for some suggestions from some experts who are more
experienced in such field.
Did you ever measure the throughput of your network? If possible, let's
share some experience. :)
BR
Ming
From: Thomas Denzinger <[EMAIL PROTECTED]>
To: <[email protected]>
Subject: Speed of plb_temac 3.00 on ML403
Date: Tue, 05 Dec 2006 17:18:07 +0100
Hi all,
I have to interface to a camera with the GigE Vision protocol.
For that I set up a design on ML403 with PPC, Temac and sgDMA. I use
MontaVista 2.4.20 Linux with the BSP from Xilinx EDK 8.2. The camera vendor
supplied a library for GigE Vision, which works under Linux.
The results of some tests showed that I have to insert waiting time
between frames sent by the camera, otherwise the lib signals errors.
This leeds to only 1/10 of the needed transfer rate.
My question is now: Has anybody deeper knowledge how ethernet and sgDMA
works? How deep is the PPC involved in the data transfer? Or does the
Temac-core handle the datatransfer to DDR-memory autonomous?
I learnd from the camera vendor, that on PCs with special Intel ethernet
chips, it works outonomous and so the high transfer rate can be
accomplished.
I'm very interested to get in contact with people who have to interface
with a GigE Vision camera.
Also interesting is if anybody benchmarked the gigabit ethernet on the
ML403 hardware. How fast is the gigabit interface realy?
Thomas
--
Thomas Denzinger
LesaMetric GmbH
Hauptstrasse 46
35649 Bischoffen
Tel.: 06444/931928
Fax : 06444/931912
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