RE: ML403 gigabit ethernet bandwidth - 2.6 kernel

Dear Ming,

Really thanks for reply,

about thresholds and waitbound OK! I'll adjust them in adapter.c ,

but what about enabling jumbo frames? should I do any thing special to enable Jumbo fram support? 

we were thinking that it is enabled by default. Is it?

thanks




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From: eemingliu@hotmail.com
To: mamsadegh@hotmail.com; akonovalov@ru.mvista.com; linuxppc-embedded@ozlabs.org; grant.likely@secretlab.ca
Subject: RE: ML403 gigabit ethernet bandwidth - 2.6 kernel
Date: Sat, 23 Jun 2007 18:48:19 +0000

Dear Mohammad,
There are some parameters which could be adjusted to improve the 
performance. They are: TX and RX_Threshold TX and RX_waitbound. In my 
system, we use TX_Threshold=16 and Rx_Threshold=8 and both waitbound=1.

Also Jumbo frame of 8982 could be enable.

Try those hints and share your improvement with us.

BR
Ming

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From: Mohammad Sadegh Sadri 
To: Andrei Konovalov , Linux PPC Linux 

PPC, Grant Likely 

quoted

Subject: ML403 gigabit ethernet bandwidth - 2.6 kernel 
Date: Sat, 23 Jun 2007 12:19:12 +0000


Dear all,

Recently we did a set of tests on performance of virtex 4FX hard TEMAC 

module using ML403

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we studied all of the posts here carefully: these are the system 

characteristics;

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Board : ML403
EDK    : EDK9.1SP2
Hard TEMAC version and PLTEMAC version are both 3.0.a
PPC clock frequency :  300MHz
Kernel : 2.6.21-rc7 , downloaded from grant's git tree some thing near one 

week ago

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DMA type: 3 (sg dma)
DRE : enabled for TX and RX, (2)
CSUM offload is enabled for both of TX and RX
tx and rx fifo sizes : 131072 bits

the board comes up over NFS root file system completely and without any 

problems.

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PC system used for these tests is : CPU P4 Dual Core, 3.4GHz , 2Gigabytes 

memory, Dual gigabit ethernet port, running linux 2.6.21.3

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We have tested the PC system band width and it can easily reach 966mbits/s 

when connected to the same PC. ( using the same cross cable used for ml403 
test)

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Netperf is compiled with TCP SEND FILE enabled, ( -DHAVE_SENDFILE)

(from board to PC)
netperf -t TCP_SENDFILE -H 10.10.10.250 -F /boot/zImage.elf -- -m 16384 -s 

87380 -S 87380

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the measured bandwidth for this test was just 40.66Mbits.
It is also true for netperf from PC to board.

we do not have any more idea about what we should do to improve the 

bandwidth.

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any help or ideas is appreciated...

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quoted

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