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List:       tru64-unix-managers
Subject:    SUMMARY: Netscape Enterprise Server
From:       "Wakeman, Lindsay" <Lindsay.Wakeman () bl ! uk>
Date:       2003-09-30 14:27:35
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Thanks as ever to those kind folks who replied: Elizabeth Harvey-Forsythe
and Jeff Payne.

The view does seem to indicate this is a resource issue, and that some form
of tuning may help alleviate.

Elizabeth suggested a minimum value for maxusers of 256 (I have this already
set to 2048)

and Jeff sent me the following from 'Compaq Tru64 UNIX Best Practice -
Primary Tuning Recommendations for Internet Servers Sept 2000'

"
   Compaq advise the following:

   Set following kernel attributes in kernel tuner: 

   inet
   	tcbhashsize = 16384
   	pmtu_enabled = 0

   proc
   	maxusers = 20
   	max_proc_per_user = 2000
   	max_threads_per_user =4096
   	max_per_proc_data_size=10737418240
   	max_per_proc_address_space=10737418240

   socket
   	somaxconn=65535
   	sominconn=65535

   vm
   	vm-mapentries=20000
   	vm-maxvas=10737418240    "

(I think that maxusers is definitely a bit low!) I have not yet tested all
of these changes. I plan to go ahead with the socket recommendations at
least, and also with some recommended settings for ephemeral ports which may
help alleviate TCP TIME_WAIT congestion - see 
www.ncftpd.com/ncftpd/doc/misc/ephemeral_ports.html 

 But there's an element of guesswork involved in these things, as there
doesn't seem to be any system-reported problem when the Netscape error
happens. If any of this cures the problem, I'll summarise again.

Thanks again,

Lindsay

> -----Original Message-----
> From: Wakeman, Lindsay [mailto:Lindsay.Wakeman@bl.uk]
> Sent: 19 September 2003 16:17
> To: 'tru64-unix-managers@ornl.gov'
> Subject: Netscape Enterprise Server
> 
> 
> 
>  I know this has been raised before on this list, but I 
> couldn't find a
> summary. Nothing
> specific in other lists either.
> 
> We run Netscape Enterprise Server 3.6 on Tru64 UNIX 4.0E
> 
> We get a huge number of errors like these in our Netscape 
> server error logs:
> 
>       failure (<pid>): Error accepting connection -5993 
> (Operation would
> block)
> 
>   and
>  
>       failure (<pid>): Error accepting connection 32 (unable 
> to map error
> number 32)
> 
>  and
> 
>       failure (<pid>): Error accepting connection -5993 (Socket is not
> connected)
> 
> 
>  Sorry if a little off topic, but could this be a network 
> resource problem?
> 
>  Thanks
> 
>  Lindsay
> 
> Lindsay Wakeman
> Senior Analyst/Programmer, Applications Development South
> The British Library
> lindsay.wakeman@bl.uk
> 
> 
> 


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