[solaris]TCP clnt_max_conns testing tuning Post: 302870101

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Special Forums IP Networking [solaris]TCP clnt_max_conns testing tuning Post 302870101 by jim mcnamara on Friday 1st of November 2013 07:15:47 AM

11-01-2013

Registered User

I have an m4000 with 6 10GB nics. With link aggregation. We have clnt_max_conns=1. If you have the correct drivers you normally do not need to tweak this. It is meant for a really fast system connected to lots of slower or very remote boxes (with lots of latency) to enable multiplexing. It handles the disparity in local response times. Like multipathing.

Try loading and then measuring:

Maybe the NFS traffic load across systems is not high enough to push the new connection(s). Or your code base is really well-written. Unlikely, I admit. Ours is awful.

So - artificially increase the NFS traffic by writing some threaded code that reads (or writes) many files at one time. Be sure to do something to avoid the effects of local file caching, or what you will really be measuring is not NFS TCP effects. This will not fly on a production box. You should have svc_t waits of 50ms+ (as a guess) if you are really saturating the connection/driver.

IMO, what you want to look at is iostat -xnmz 1 10 - svc_t time, %b, etc.
-- for NFS mounts. iperf is also relevant, BTW. It is a valid tool.

If your before/after change does not impact this kind test, you are wasting your time with the change.

jim mcnamara

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LEARN ABOUT DEBIAN

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.
	      Please notice this option isn't related to the terminal length as in a "80 culums terminal".

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do right to left (RTL) layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter and A4. Default is A4.

       Postscript points
	      Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch.

       --bottom-margin=bm
	      Set bottom margin. Default is 36 postscript points.

       --top-margin=tm
	      Set top margin. Default is 36 postscript points.

       --left-margin=lm
	      Set left margin. Default is 36 postscript points.

       --right-margin=rm
	      Set right margin. Default is 36 postscript points.

       --gutter-width=gw
	      Set gutter width. Default is 40 postscript points.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)

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