nanog mailing list archives
Re: Whats so difficult about ISSU
From: Saku Ytti <saku () ytti fi>
Date: Sat, 10 Nov 2012 00:07:45 +0200
On (2012-11-09 16:58 -0500), Pete Lumbis wrote:
I do not believe that the linux scheduler is run to completion, but to be honest I'm not 100% certain. I know a big reason for IOS-XE was to
It certainly is not, I'm not proposing it is. I'm saying it is bit of a stretch to believe that IOSd does not have own legacy scheduler and memory management as pulling that switch would have been quite major rework.
be able to operate in multicore environments. From a high level you have IOSd as a process with each traditional process (BGP, OSPF, IP Input) as a thread within IOSd. Overall IOS-XE is Linux managing a few processes: IOSd, FMan-RP, CMan-RP (and a few others) FMan deals with adjacencies and CMan deals with modules/cards and IOSd all the interesting stuff. Since Linux is the piece actually running the show IOS-XE gets all the memory management and scheduling benefits that linux has.
So each IOSd process 'show proc cpu' are separate threads to linux? -- ++ytti
Current thread:
- Re: Whats so difficult about ISSU, (continued)
- Re: Whats so difficult about ISSU Mikael Abrahamsson (Nov 08)
- Re: Whats so difficult about ISSU Jonathan Lassoff (Nov 08)
- Re: Whats so difficult about ISSU Jimmy Hess (Nov 11)
- Re: Whats so difficult about ISSU Mikael Abrahamsson (Nov 08)
- Re: Whats so difficult about ISSU Juuso Lehtinen (Nov 08)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 08)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 09)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 09)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 09)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 10)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 10)
- Re: Whats so difficult about ISSU Randy Bush (Nov 10)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 10)
- Re: Whats so difficult about ISSU Nick Hilliard (Nov 10)
- Re: Whats so difficult about ISSU sthaug (Nov 10)
- Re: Whats so difficult about ISSU Randy Bush (Nov 10)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 11)
- Re: Whats so difficult about ISSU Randy Bush (Nov 11)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)