[Info-vax] Accuweather new contract

[Kerry Main]

> -----Original Message-----
> From: Info-vax [mailto:info-vax-bounces at info-vax.com] On Behalf Of
> Jan-Erik Soderholm
> Sent: 30-Mar-15 7:32 AM
> To: info-vax at info-vax.com
> Subject: Re: [New Info-vax] Accuweather new contract
> 
> Kerry Main skrev den 2015-03-30 05:25:
> >> -----Original Message-----
> >> From: Info-vax [mailto:info-vax-bounces at info-vax.com] On Behalf Of
> >> Craig A. Berry
> >> Sent: 29-Mar-15 9:13 PM
> >> To: info-vax at info-vax.com
> >> Subject: Re: [New Info-vax] Accuweather new contract
> >>
> >> On 3/29/15 6:03 PM, Kerry Main wrote:
> >>>> -----Original Message-----
> >>>> From: Info-vax [mailto:info-vax-bounces at info-vax.com] On Behalf
> Of
> >>>> johnson.eric at gmail.com
> >>>> Sent: 29-Mar-15 4:49 PM
> >>>> To: info-vax at info-vax.com
> >>>> Subject: Re: [New Info-vax] Accuweather new contract
> >>
> >>>> My basic mode of comparison was... how long does it take to send
> a
> >>>> single
> >>>> 80 byte UDP packet. I measured that by doing that in a tight loop. It
> >> was
> >>>> pretty
> >>>> easy to write a portable version that ran on both Linux and VMS.
> For
> >>>> grins
> >>>> I also write a version that used the QIO$ interface. That improved
> >> things
> >>>> a little
> >>>> bit, but Linux still won by a wide margin.
> >>>>
> >>>> EJ
> >>>
> >>> Not saying that Linux might be marginally faster, but usually when
> >> there Is
> >>> a "wide margin", there is usually something else under pinning the
> >> results.
> >>>
> >>> When network results like this are seen, I usually think of the mis-
> >> matched
> >>> full duplex auto-config issue with older network gear, NIC's and
> drivers.
> >>
> >> Kerry, please read more details of Eric's careful analysis in the
> >> archives of this group before posting such nonsense.
> >
> > As I recall, Eric's previous analysis showed OpenVMS network numbers
> > to be approx. half those of Linux which would be exactly what would
> be
> > he case if the autoconfig issue were present when he did the testing.
> 
> An missconfigured half/full duplex will usualy give something
> of 1:100 to 1:1000 diference. More or less a full halt.
> 
> The network is more or less useless apart from small packages.
> 
> Jan-Erik.

No - that is not correct.

Symptoms depend on how much the network is used and the speed
of the NIC.

I have seen this issue a number of times and the symptoms are:
- no errors at system or in error log 
- everything works, but network transfers are very slow

What would happen sometime is everything is working well, system 
gets rebooted for some reason, when it comes back up, everything 
works, but complaints about network performance start coming in.

A reboot may even fix the issue (depending of course on the boot
/ network hand shaking). 

Regards,

Kerry Main
Back to the Future IT Inc.
 .. Learning from the past to plan the future

Kerry dot main at backtothefutureit dot com