Dear Rick,
Now I am measuring the performance of my TEMAC on ml403 using netperf.
However I cannot get a performance as high as yours(550Mbps for TX). My
data is listed here:
Board --> PC (tx)
# ./netperf -H 192.168.0.3 -C -t TCP_STREAM -- -m 8192 -s 253952 -S 253952
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.3
(192.168.0.3) port 0 AF_INET
Recv Send Send Utilization Service
Demand
Socket Socket Message Elapsed Send Recv Send Recv
Size Size Size Time Throughput local remote local
remote
bytes bytes bytes secs. 10^6bits/s % U % S us/KB
us/KB
262142 206848 8192 10.00 64.51 -1.00 2.59 -1.000
6.587
PC --> board (rx)
linux:/home/mingliu/netperf-2.4.1 # netperf -H 192.168.0.5 -C -t TCP_STREAM
-- -m 14400 -s 253952 -S 253952
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.5
(192.168.0.5) port 0 AF_INET
Recv Send Send Utilization Service
Demand
Socket Socket Message Elapsed Send Recv Send Recv
Size Size Size Time Throughput local remote local
remote
bytes bytes bytes secs. 10^6bits/s % U % U us/KB
us/KB
206848 262142 14400 10.02 169.09 -1.00 -1.00 -1.000
-0.484
I think this performance is much slower than what you have described. So
what's the problem? I am using the old cores of TEMAC(plb_temac 2.00.a and
hard_temac 1.00.a and DMA type is 3, Tx and Rx FIFO lengths are both
131072, large enough?). My linux is 2.6.16 from the general kernel with the
temac driver patched. The driver is from the patch
http://source.mvista.com/~ank/paulus-powerpc/20060309/. Is this bad
performance because of the old cores, or the driver? Or Montavista Linux is
RTOS and it should have a much better performance like this? You must be
more experienced on the performance issue and your suggestion will be
extreamly useful for me.
Anxious for your suggestion and explanation.
Regards
Ming
From: "Rick Moleres" <[EMAIL PROTECTED]>
To: "Michael Galassi" <[EMAIL PROTECTED]>,"Thomas Denzinger"
<[EMAIL PROTECTED]>
CC: [email protected]
Subject: RE: Speed of plb_temac 3.00 on ML403
Date: Tue, 5 Dec 2006 12:08:58 -0700
Thomas,
Yes, Michael points out the hardware parameters that are needed to
enable SGDMA along with DRE (to allow unaligned packets) and checksum
offload. It also helps the queuing if the FIFOs in the hardware (Tx/Rx
and IPIF) are deep to handle fast frame rates. And finally, better
performance if jumbo frames are enabled. Once SGDMA is tuned (e.g.,
number of buffer descriptors, interrupt coalescing) and set up, the PPC
is not involved in the data transfers - only in the setup and interrupt
handling.
With a 300Mhz system we saw about 730Mbps Tx with TCP on 2.4.20
(MontaVista Linux) and about 550Mbps Tx with TCP on 2.6.10 (MontaVista
again) - using netperf w/ TCP_SENDFILE option. We didn't investigate the
difference between 2.4 and 2.6.
-Rick
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Michael Galassi
Sent: Tuesday, December 05, 2006 11:42 AM
To: Thomas Denzinger
Cc: [email protected]
Subject: Re: Speed of plb_temac 3.00 on ML403
>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?
Thomas,
If you cut & pasted directly from my design you may be running without
DMA, which in turn implies running without checksum offload and DRE.
The plb_temac shrinks to about half it's size this way, but if you're
performance bound you probably want to turn DMA back on in your mhs
file:
PARAMETER C_DMA_TYPE = 3
PARAMETER C_INCLUDE_RX_CSUM = 1
PARAMETER C_INCLUDE_TX_CSUM = 1
PARAMETER C_RX_DRE_TYPE = 1
PARAMETER C_TX_DRE_TYPE = 1
PARAMETER C_RXFIFO_DEPTH = 32768
You'll have to regenerate the xparameters file too if you make these
changes (in xps: Software -> Generate Libraries and BSPs).
There may also be issues with the IP stack in the 2.4 linux kernels.
If you have the option, an experiment with at 2.6 stack would be
ammusing.
-michael
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