ethernet packet drop

ethernet packet drop

[Mehul Chadha]

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Hello everyone,

                       I am working on a project for router development.

The basic specifications of the router are as follows:

·         Supports MPC8248 - 32-bit PowerQUICC II Communication Processor
running at 400 MHz (Max) core frequency, 200 MHz (Max) CPM, and 100MHz (Max)
external bus frequency.

·         64-bit wide 256-MByte synchronous DRAM (soldered on-board),
 consisting
of 4 no. devices of 8M x 16 x 4, residing on 60X bus (PBI mode), controlled
by SDRAM machine.

·         256 MB NAND Flash, organized as 256M x 8, buffered from 60X bus,
controlled by UPM machine.

·         Upto 8MB NOR Flash, Boot sector (bottom) type, organized as 8M x
8, buffered from 60X bus, controlled by GPCM machine.

·           Linux Kernel version: linux-2.6.16.40


While testing my router with the spirent test equipment, the 2 ethernet
ports of the router are connected to the testing equipment. I send data from
the testing equipment through the ethernet port , the router forwards the
packet to the other ethernet port again connected to the testing equipment.
When I increase the throughput to 70 mbps the testing equipment starts
showing packet losses which should not happen as its a 10/100 mbps link. I
am not able to understand where would the problem lie. Pls if someone can
list the different issues due to which this problem is occurring, it will be
really helpful


Regards,

Mehul

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Re: ethernet packet drop

[Parav Pandit]

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Couple of points to debug,

1. Do you see any pause frames getting generated by Router device and not honoured by Spirent test equipment?

2. Checkout the MPC8248' load if you have console connected to it, using #top command.

Parav

--- On Wed, 6/17/09, Mehul Chadha <mehulc87@gmail.com> wrote:

From: Mehul Chadha <mehulc87@gmail.com>
Subject: ethernet packet drop
To: linuxppc-dev@lists.ozlabs.org
Date: Wednesday, June 17, 2009, 8:23 PM

Hello everyone,

                       I am working on a project for router development.

The basic specifications of the router are as follows:




·        
Supports MPC8248 - 32-bit PowerQUICC II Communication Processor running
at 400 MHz (Max) core frequency, 200 MHz (Max) CPM, and 100MHz (Max) external
bus frequency.

·        
64-bit wide 256-MByte synchronous DRAM (soldered
on-board),   consisting of 4 no. devices
of 8M x 16 x 4, residing on 60X bus (PBI mode), controlled by SDRAM machine.

·        
256 MB
NAND Flash, organized as 256M x 8, buffered from 60X bus, controlled by UPM
machine.

·        
Upto 8MB
NOR Flash, Boot sector (bottom) type, organized as 8M x 8, buffered from 60X
bus, controlled by GPCM machine. 




·           Linux Kernel version: linux-2.6.16.40

While testing my router with the spirent test equipment, the 2 ethernet ports of the router are connected to the testing equipment. I send data from the testing equipment through the ethernet port , the router forwards the packet to the other ethernet port again connected to the testing equipment. When I increase the throughput to 70 mbps the testing equipment starts showing packet losses which should not happen as its a 10/100 mbps link. I am not able to understand where would the problem lie. Pls if someone can list the different issues due to which this problem is occurring, it will be really helpful

Regards,Mehul






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