nanog mailing list archives
Re: Whats so difficult about ISSU
From: Pete Lumbis <alumbis () gmail com>
Date: Fri, 9 Nov 2012 08:02:49 -0500
I can't speak for JunOS, but none of the "new" IOS operating systems are run to completion. This includes IOS-XE, XR and NX-OS. On Fri, Nov 9, 2012 at 2:36 AM, Saku Ytti <saku () ytti fi> wrote:
When we start on that premise, we can do silly things like write run-to-completion operating systems like IOS and JunOS (rpd). Which means single guy making one bad judgement call, and whole OS is bad. Of course run-to-completion is most optimum way to execute code, if your code is flawless, but that ship has sailed. Possibly when IOS started CPU time was premium and it was cheaper to through code review money at the problem. But today it clearly is cheaper to add power to control plane and have levels of abstraction in control-plane which saves the system from bad code, i.e. design your control-plane assuming code you deliver isn't good.
Current thread:
- Re: Whats so difficult about ISSU, (continued)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Oliver Garraux (Nov 08)
- Re: Whats so difficult about ISSU Phil (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (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 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)