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<== Date ==> <== Thread ==>

Subject: RE: Slow booting ioc
From: johill@lanl.gov (Jeff Hill)
To: "'Andrew Johnson'" <anj@aps.anl.gov>
Cc: "'Garrett D. Rinehart'" <rinehart@aps.anl.gov>, "mrk@aps.anl.gov" <mrk@aps.anl.gov>, "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 21 Jan 1999 14:29:44 -0700
On Thursday, January 21, 1999 1:49 PM, Andrew Johnson [SMTP:anj@aps.anl.gov] wrote:
> Jeff Hill wrote:
> > 
> > In the past long boot delays have been observed when an IOC comes up and reuses
> > the same IOC side dynamically assigned TCP port that it was using in the past. In this situation
> > some IP kernels on the server side detect out of order TCP/IP sequence numbers but will
> > not disconnect until a long time out has expired. I don't know why changing the version of EPICS
> > would have any impact on this. Apparently this behavior varies with the version and vendor
> > of the IP kernel.
> 
> In this circumstance though the long delay seems to be on access to
> every file, and I thought the symptoms Jeff described only occurred once
> at startup (I may be mistaken though).
> 

Typically I see these delays only once during the boot, but sometimes (usually) it is the 
symbol table, and not the first file loaded (the system image) that seems to delay the boot
for an extended period. This delay appears to track with certain models of single board computers 
(SBCs) when other SPCs models boot normally off the same server. I dont claim to fully understand
this behavior. The systems here with this affliction boot reliably, but continue to tax our patience.

Jeff

Replies:
Re: Slow booting ioc Andrew Johnson

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