From: Glauber Costa <glommer@redhat.com>
To: Dietmar Maurer <dietmar@proxmox.com>
Cc: Avi Kivity <avi@redhat.com>,
Anthony Liguori <anthony@codemonkey.ws>,
kvm <kvm@vger.kernel.org>
Subject: Re: migrate_set_downtime bug
Date: Wed, 7 Oct 2009 09:32:53 -0300 [thread overview]
Message-ID: <20091007123253.GN8092@mothafucka.localdomain> (raw)
In-Reply-To: <90D306BE6EBC8D428A824FBBA7A3113D010EFFE902@ronja.maurer-it.com>
On Wed, Oct 07, 2009 at 06:42:48AM +0200, Dietmar Maurer wrote:
> > > The default downtime is set to 30ms. This value triggers the
> > convergence problem quite often. Maybe a longer default is more
> > reasonable.
> > What do you feel about 100 ms?
>
> What is the reasoning behind such short downtimes? Are there any application that will fail with longer downtimes (let say 1s)?
>
> Note: on a 1Gbit/s net you can transfer only 10MB within 100ms
which accounts for more than 2 thousand pages, which sounds like enough for a first pass to me. For the default case,
It is hard to imagine an application dirtying more than 2k pages per-iteration
next prev parent reply other threads:[~2009-10-07 12:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-29 13:00 migrate_set_downtime bug Dietmar Maurer
2009-09-29 14:36 ` Dietmar Maurer
2009-09-29 15:09 ` Dietmar Maurer
2009-09-29 15:39 ` Anthony Liguori
2009-09-29 16:23 ` Glauber Costa
2009-09-29 16:36 ` Dietmar Maurer
2009-09-30 4:48 ` Glauber Costa
2009-09-30 6:58 ` Dietmar Maurer
2009-09-30 8:55 ` Dietmar Maurer
2009-09-30 11:23 ` Glauber Costa
2009-09-30 14:11 ` Dietmar Maurer
2009-09-30 16:39 ` Glauber Costa
2009-09-30 18:41 ` Dietmar Maurer
2009-10-05 12:17 ` Avi Kivity
2009-10-05 13:04 ` Glauber Costa
2009-10-05 13:17 ` Avi Kivity
2009-10-05 14:09 ` Dietmar Maurer
2009-10-05 15:32 ` Glauber Costa
2009-10-06 8:30 ` Dietmar Maurer
2009-10-06 17:33 ` Glauber Costa
2009-10-07 4:42 ` Dietmar Maurer
2009-10-07 12:32 ` Glauber Costa [this message]
2009-10-07 19:40 ` Dietmar Maurer
2009-10-05 14:01 ` Dietmar Maurer
2009-10-05 14:06 ` Avi Kivity
2009-10-05 14:08 ` Dietmar Maurer
2009-10-05 14:15 ` Avi Kivity
2009-10-05 14:11 ` Dietmar Maurer
2009-10-05 14:18 ` Dietmar Maurer
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