From: "Ming Liu" <eemingliu@hotmail.com>
To: t.denzinger@lesametric.de
Cc: linuxppc-embedded@ozlabs.org
Subject: RE: Speed of plb_temac 3.00 on ML403
Date: Tue, 05 Dec 2006 16:49:28 +0000 [thread overview]
Message-ID: <BAY110-F3944DE74236D959AF9FB6B2DE0@phx.gbl> (raw)
In-Reply-To: <13134516.38521165335487229.JavaMail.servlet@kundenserver>
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 <t.denzinger@lesametric.de>
>To: <linuxppc-embedded@ozlabs.org>
>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
>_______________________________________________
>Linuxppc-embedded mailing list
>Linuxppc-embedded@ozlabs.org
>https://ozlabs.org/mailman/listinfo/linuxppc-embedded
_________________________________________________________________
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next prev parent reply other threads:[~2006-12-05 16:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-05 16:18 Speed of plb_temac 3.00 on ML403 Thomas Denzinger
2006-12-05 16:49 ` Ming Liu [this message]
2006-12-05 18:42 ` Michael Galassi
2006-12-05 19:08 Rick Moleres
2006-12-12 11:08 ` Ming Liu
2007-02-09 14:16 ` Ming Liu
2007-02-09 14:57 ` jozsef imrek
2007-02-11 15:25 ` Ming Liu
2007-02-12 18:09 ` jozsef imrek
2007-02-12 19:18 ` Ming Liu
2007-02-14 7:24 ` jozsef imrek
2007-02-09 16:00 ` Rick Moleres
2007-02-11 6:22 ` Leonid
2007-02-11 13:37 ` Ming Liu
2007-02-12 19:45 ` Rick Moleres
2007-02-12 20:39 ` Ming Liu
2006-12-13 0:11 Rick Moleres
2006-12-17 15:05 ` Ming Liu
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