From: Jacob Gorm Hansen <jacobg@diku.dk>
To: Ian Pratt <Ian.Pratt@cl.cam.ac.uk>
Cc: James Harper <JamesH@bendigoit.com.au>, xen-devel@lists.sourceforge.net
Subject: Re: migration
Date: Fri, 01 Oct 2004 17:21:57 +0200 [thread overview]
Message-ID: <415D7615.8050808@diku.dk> (raw)
In-Reply-To: <E1CDOAs-0006C9-00@mta1.cl.cam.ac.uk>
Ian Pratt wrote:
>>>Live migration is a lot more "exciting" from an
>>>implementation point of view than stop-and-copy, so if you do
>>>have bug reports it would be very useful to know whether you
>>>can repeat them in stop-and-copy mode.
>>
>>I was logged in the whole time and there was about 1/2 a second where it
>>seemed to freeze, but no bugs to report.
>
>
> With the old xend and old IO we used to get live migration times
> downtimes in the order of <50ms for quiescent domains.
>
> I'm confident we can get back to that order of performance with a
> few tweaks Mike and I are currently working on.
hi,
I have an alternative implementation, where live-migration takes place
entirely within the guest domain. It is currently only implemented for
Linux 2.4, and in the old 1.3 I/O model. It has (in my opinion) a few
benefits, because Linux is able to make better informed decisions during
migration than Xen is.
My hope is to someday be compatible with the latest and greatest
Xen-version, so I have not released any source for this yet. However, if
you are interested, let me know and I can send you my patches for
XenoLinux (no changes to Xen needed), or some binaries to play with.
There is a short paper describing my approach at
http://www.diku.dk/~jacobg/nomadxen.pdf
best,
Jacob
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next prev parent reply other threads:[~2004-10-01 15:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-01 11:14 migration James Harper
2004-10-01 14:14 ` migration Ian Pratt
2004-10-01 15:21 ` Jacob Gorm Hansen [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-10-01 1:01 migration James Harper
2004-10-01 10:43 ` migration Ian Pratt
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