[Info-vax] Accuweather new contract

[Jan-Erik Soderholm]

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.