From: Samuel Thibault <samuel.thibault@eu.citrix.com>
To: "Mike D. Day" <ncmike@us.ibm.com>
Cc: Nauman Rafique <naumanr@gmail.com>, xen-devel@lists.xensource.com
Subject: Re: CPU scheduling of domains and vcpus
Date: Mon, 21 Apr 2008 22:34:13 +0100 [thread overview]
Message-ID: <20080421213413.GE6127@implementation> (raw)
In-Reply-To: <20080421203218.GA14282@silverwood.ncultra.org>
Mike D. Day, le Mon 21 Apr 2008 16:32:18 -0400, a écrit :
> On 21/04/08 18:56 +0100, Samuel Thibault wrote:
> > Nauman Rafique, le Mon 21 Apr 2008 13:52:21 -0400, a écrit :
> > > In fact, wasted cycles can probably be avoided by doing opportunisitic
> > > gang scheduling (i.e. gang schedule, unless there would be wasted
> > > cycles)
> >
> > How do you detect that there would be wasted cycles?
>
> The only way is for a very self-aware guest to use a paravirtual
> feature to give a hint to the scheduler.
Agreed :)
> Alternatively, the scheduler can notify the guest that it is about to
> be preempted by the hypervisor and now would be a good time to sleep
> before gaining a contended spinlock.
Mmm, "about to be" means "on the next tick" then. That may be a long
time.
Samuel
next prev parent reply other threads:[~2008-04-21 21:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-21 17:52 CPU scheduling of domains and vcpus Nauman Rafique
2008-04-21 17:56 ` Samuel Thibault
2008-04-21 20:32 ` Mike D. Day
2008-04-21 21:34 ` Samuel Thibault [this message]
2008-04-22 18:34 ` Nauman Rafique
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