Junos
Junos

Does Junos use all cores on a multicore RE (on MX router)

‎12-29-2014 07:35 AM

Hi All

 

It looks like 32-bit Junos 12.3R6.6 on quad core RE-S-1800x4 only uses one core

 

% sysctl hw.ncpu
hw.ncpu: 1 

 

(and, of course, only 3.5GB of RAM). Will it use all cores if we upgrade to 64-bit?

I wasn't able to find any info on that.

Best Regards,
PK

Juniper Ambassador, Juniper Networks Certified Instructor,
JNCIE-SEC #98, JNCIE-ENT #393, JNCIE-SP #2253
Twitter: @JuniperTrain
GitHub: https://github.com/pklimai
[Juniper Authorized Education & Support in Russia]
4 REPLIES 4
Junos

Re: Does Junos use all cores on a multicore RE (on MX router)

‎12-29-2014 10:27 AM

Our 64-bit RE-S-1800x4 shows the same:

 

% sysctl hw.ncpu
hw.ncpu: 1

 

Judging from complaints I've seen on the j-nsp mailing list, I'd say that the RE does not take advantage of the multiple cores, but I defer to Juniper employees to provide a definitive answer.

Junos
Solution
Accepted by topic author pk
‎08-26-2015 01:27 AM

Re: Does Junos use all cores on a multicore RE (on MX router)

‎01-01-2015 04:27 AM

Hello,

 


@pk wrote:

Hi All

 

It looks like 32-bit Junos 12.3R6.6 on quad core RE-S-1800x4 only uses one core

 


SMP (symmetrical multi processor) capability for JUNOS is a roadmap item, please contact Your nearest Juniper Systems Engineer for more information.

 


@pk wrote:

 

(and, of course, only 3.5GB of RAM). 


You can make RPD to use more memory on RE which support it by switching on 64-bit RPD support

 

system {
processes {
routing {
force-32-bit | force-64-bit | auto-64-bit;
}}}

 

https://www.juniper.net/documentation/en_US/junos13.3/topics/reference/configuration-statement/routi...

 

HTH

Thanks

Alex

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Junos

Re: Does Junos use all cores on a multicore RE (on MX router)

‎01-01-2015 07:15 AM

Hi Alex,

 

Thanks a lot for the info, good to know this is on roadmap.

 

However I cannot understand the following phrase from your link

"Default - Routing process is enabled to use 32-bit mode if Routing Engine memory is sufficient."

 

What do they mean? RPD will run in which mode on quad core RE with 16GB of RAM and 64-bit Junos?

Is it a misprint and they mean 64-bit by default, if RE memory is sufficient?

 

Best Regards,
PK

Juniper Ambassador, Juniper Networks Certified Instructor,
JNCIE-SEC #98, JNCIE-ENT #393, JNCIE-SP #2253
Twitter: @JuniperTrain
GitHub: https://github.com/pklimai
[Juniper Authorized Education & Support in Russia]
Junos

Re: Does Junos use all cores on a multicore RE (on MX router)

‎01-01-2015 12:50 PM

Hello,

 

I believe it's a copy-paste error. The default is 32-bit RPD and 64-bit RPD can be switched on in the config if (1) 64-bit JUNOS is installed and (2) there is sufficient memory to run 64-bit RPD. 

Please open a JTAC case (now called Service Request, after new Case Manager was introduced in Dec 2014) to get the documentation corrected.

HTH

Thanks

Alex

 

_____________________________________________________________________

Please ask Your Juniper account team about Juniper Professional Services offerings.
Juniper PS can design, test & build the network/part of the network as per Your requirements

+++++++++++++++++++++++++++++++++++++++++++++

Accept as Solution = cool !
Accept as Solution+Kudo = You are a Star !