From: Wakeman, Lindsay (Lindsay.Wakeman@bl.uk)
Date: Tue Sep 30 2003 - 10:27:35 EDT
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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