Re: [ECOS] Fourfold decrease in speed of TCPIP interface when changing from OpenBSD to FreeBSD stack

[Steven De Rango <steve dot derango at analog dot com>]

> Which platform (the VADS 8260)?

I am running on a customised version of the Motorola PowerQUICC MPC8260
development board (MPC8260 PowerQUICC II ADS).  It has a Motorola PowerQUICC
MPC8260 and six Analog Devices TigerSHARC (ADSP-TS101) DSPs.

> What do you mean by this?  Do you mean the link speed?

The TCPIP server I am running on the Motorola PPC is performing remote file
I/O on the TCPIP client.  It reads some files, performs processing and writes
the results back to the files.  One of the tests I was running took 3 sec.
After rebuilding the eCos kernel (that I checked out from the CVS repository
on the 19 Dec 2002) with the new network stack (FreeBSD) and then rebuilding
my application, the test took 14 sec.  This is what I mean by "speed".


> I don't see this behavior at all.  I just tried running our standard
> performance tests (nc_test_slave) on both the new and the old stacks
> and for the most part, the new stack gave me more (up to 20%) 
> performance.

It looks like the TCPIP stack may not be the problem and I need to profile my
application and find where it is slowing down.  Any suggestions on how I
should do this (or could you point me to some relevant documentation)?


Regards,

Steven De Rango (steve.derango@analog.com)
DSP Design Engineer, Analog Devices Australia Pty Ltd
Unit 3, 97 Lewis Road, Wantirna, Victoria, 3152, AUSTRALIA
Tel: +61 3 9800 2000     Fax: +61 3 9800 2111     Web: www.analog.com/ada

DSP software solutions for multimedia & telecommunications
specialising in 3G wireless, speech & image processing

This communication is Proprietary and Confidential.


> On Wed, 2003-01-22 at 23:04, Steven De Rango wrote:
> > Does anybody why the TCPIP interface would slow down when changing from
> > OpenBSD to FreeBSD TCPIP stacks?
> > 
> > Is there some way to improve the speed of the FreeBSD TCPIP interface?
> > 
> > I could not find any information related to TCPIP interface speed on this
> > mailing list.
> > 
> 
> What do you mean by this?  Do you mean the link speed?
> 
> > I am running my application on the Motorola MPC8260.
> > 
> 
> I don't see this behavior at all.  I just tried running our standard
> performance tests (nc_test_slave) on both the new and the old stacks
> and for the most part, the new stack gave me more (up to 20%) 
> performance.
> 
> What sort of traffic are you running?
> Which platform (the VADS 8260)?
> 
> -- 
> .--------------------------------------------------------.
> |       Mind: Embedded Linux and eCos Development        |
> |--------------------------------------------------------|
> | Gary Thomas              email:  gary.thomas@mind.be   |
> | Mind ( http://mind.be )  tel:    +1 (970) 229-1963     |
> | gpg: http://www.chez-thomas.org/gary/gpg_key.asc       |
> '--------------------------------------------------------'
> 

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