From: Avi Kivity <avi@redhat.com>
To: Juan Quintela <quintela@redhat.com>
Cc: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>,
Anthony Liguori <anthony@codemonkey.ws>,
Paolo Bonzini <pbonzini@redhat.com>,
qemu-devel@nongnu.org, kvm-devel <kvm@vger.kernel.org>
Subject: Re: [PATCH 09/10] Exit loop if we have been there too long
Date: Wed, 01 Dec 2010 14:35:57 +0200 [thread overview]
Message-ID: <4CF6412D.5030601@redhat.com> (raw)
In-Reply-To: <m3pqtm1cqf.fsf@trasno.mitica>
On 12/01/2010 03:52 AM, Juan Quintela wrote:
> > - 512GB guest is really the target?
>
> no, problems exist with smaller amounts of RAM. with 16GB guest it is
> trivial to get 1s stalls, 64GB guest, 3-4s, with more memory, migration
> is flaky to say the less.
>
> > - how much cpu time can we use for these things?
>
> the problem here is that we are forced to walk the bitmap too many
> times, we want to do it less times.
How much time is spent walking bitmaps? Are you sure this is the problem?
> > - how many dirty pages do we have to care?
>
> default values and assuming 1Gigabit ethernet for ourselves ~9.5MB of
> dirty pages to have only 30ms of downtime.
1Gb/s * 30ms = 100 MB/s * 30 ms = 3 MB.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-12-01 12:36 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1290552026.git.quintela@redhat.com>
[not found] ` <9b23b9b4cee242591bdb356c838a9cfb9af033c1.1290552026.git.quintela@redhat.com>
[not found] ` <4CF45D67.5010906@codemonkey.ws>
[not found] ` <4CF4A478.8080209@redhat.com>
2010-11-30 13:47 ` [PATCH 09/10] Exit loop if we have been there too long Anthony Liguori
2010-11-30 13:58 ` Avi Kivity
2010-11-30 14:17 ` Anthony Liguori
2010-11-30 14:27 ` Avi Kivity
2010-11-30 14:50 ` Anthony Liguori
2010-12-01 12:40 ` Avi Kivity
2010-11-30 17:43 ` Juan Quintela
2010-12-01 1:20 ` Takuya Yoshikawa
2010-12-01 1:52 ` Juan Quintela
2010-12-01 2:22 ` Takuya Yoshikawa
2010-12-01 12:35 ` Avi Kivity [this message]
2010-12-01 13:45 ` Juan Quintela
2010-12-02 1:31 ` Takuya Yoshikawa
2010-12-02 8:37 ` Avi Kivity
2010-11-30 14:12 ` Paolo Bonzini
2010-11-30 15:00 ` Anthony Liguori
2010-11-30 17:59 ` Juan Quintela
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