Re: [ANNOUNCE] Minneapolis Cluster Summit, July 29-30

From: Lars Marowsky-Bree (lmb_at_suse.de)
Date: 07/12/04

  • Next message: Takashi Iwai: "Re: [announce] [patch] Voluntary Kernel Preemption Patch" 
    Date:	Mon, 12 Jul 2004 15:13:12 +0200
To: Arjan van de Ven <arjanv@redhat.com>

    On 2004-07-12T14:01:27,
       Arjan van de Ven <arjanv@redhat.com> said:

    > I'm not convinced that's a good idea, in that it exposes what is
    > basically VM internals to userspace, which then would become a
    > set-in-stone interface....

    But I'm also not a big fan of moving all HA relevant infrastructure into
    the kernel. Membership and DLM are the first ones; then follows
    messaging (and reliable and globally ordered messaging is somewhat
    complex - but if one node is slow, it will hurt global communication
    too, so...), next someone argues that a node always must be able to
    report which resources it holds and fence other nodes even under memory
    pressure, and there goes the cluster resource manager and fencing
    subsystem into the kernel too etc...

    Where's the border?

    And what can we do to make critical user-space infrastructure run
    reliably and with deterministic-enough & low latency instead of moving
    it all into the kernel?

    Yes, the kernel solves these problems right now, but is that really the
    path we want to head down? Maybe it is, I'm not sure, afterall we also
    have the entire regular network stack in the kernel, but maybe also it
    is not.

    Sincerely,
        Lars Marowsky-Brée <lmb@suse.de> 

    -- 
High Availability & Clustering	    \ ever tried. ever failed. no matter.
SUSE Labs, Research and Development | try again. fail again. fail better.
SUSE LINUX AG - A Novell company    \ 	-- Samuel Beckett
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