Debugging Network Performance

I was wondering if anyone could provide some pointers on monitoring and
debugging network communications. The performance of Ethernet communications
seems to vary with kernel revisions. I would like to analyze this problem
but I need a little guidance on the issue.

TIA!

=========== Previous 8260 Ethernet email ==================

2. Some relative performance measurements (HHL 2.4.2 vs. 2.4.19pre9)
			10T Hub	|	100BT switch
		 -------------------------------------|
	2.4.2	 |	410KBps	|	750KBps	  |
		 -------------------------------------|
	2.4.19 |	440KBps	|	190KBps	  |
		 --------------------------------------

	RedHat 2.4.18-3 (x86)	3900KBps

3. TOP shows as much as 48% system utilization during a single FTP transfer.
With the fix mentioned in #1, there are 0 errors reported by ifconfig.

I may be missing something but I believe that these numbers are going the
wrong way. There is still the question of performance decrease when using a
100BT switch. Signal intregety can not be the only suspect considering the
performance did increase using an older version of the kernel. (although
nothing like the Workstation performance)


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I suggest using netpipe or something so you also can see the impact of
different packet sizes.

I have attached one graph done from a walnut card but I do not remember
exactly what kernel version was used.

On Tue, 2002-06-04 at 06:34, Allen Curtis wrote:

I was wondering if anyone could provide some pointers on monitoring and
debugging network communications. The performance of Ethernet communications
seems to vary with kernel revisions. I would like to analyze this problem
but I need a little guidance on the issue.

--
Kenneth Johansson
Ericsson AB                       Tel: +46 8 404 71 83
Borgafjordsgatan 9                Fax: +46 8 404 72 72
164 80 Stockholm                  kenneth.johansson@etx.ericsson.se