Re: ML403 gigabit ethernet bandwidth - 2.6 kernel

From: "Bhupender Saharan" <bhupi.saharan@gmail.com>
To: "Mohammad Sadegh Sadri" <mamsadegh@hotmail.com>
Cc: Andrei Konovalov <akonovalov@ru.mvista.com>,
	Linux PPC Linux PPC <linuxppc-embedded@ozlabs.org>
Subject: Re: ML403 gigabit ethernet bandwidth - 2.6 kernel
Date: Mon, 25 Jun 2007 04:52:50 -0700	[thread overview]
Message-ID: <720399a30706250452m4f04f6e6w1f0fdb4b0da76b12@mail.gmail.com> (raw)
In-Reply-To: <BAY115-W1188529D49F71948165AF6B2160@phx.gbl>

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Hi,

We need to findout where is the bottlenect.

1. Run vmstat on the ML403 board and find out the percentage CPU is busy
when you are transferring the file. That will show if cpu is busy or not.
2. Run oprofile and find out which are the routines eating away the cpu
time.

Once we have data from both the above routines, we can find out the
bottlenecks.

Regards
Bhupi

On 6/23/07, Mohammad Sadegh Sadri <mamsadegh@hotmail.com> wrote:
>
>
> Dear all,
>
> Recently we did a set of tests on performance of virtex 4FX hard TEMAC
> module using ML403
>
> we studied all of the posts here carefully: these are the system
> characteristics;
>
> 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
> 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.
>
> 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
> 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)
>
> 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
>
> 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.
> any help or ideas is appreciated...
>
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