From: Olaf Hering <olaf@aepfle.de>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: xen-devel@lists.xen.org
Subject: Re: superpages lost after migration of HVM domU
Date: Thu, 20 Apr 2017 18:04:01 +0200 [thread overview]
Message-ID: <20170420160401.GH4645@aepfle.de> (raw)
In-Reply-To: <104ce757-2105-774e-f421-5ee07f5acb0b@citrix.com>
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On Thu, Apr 20, Andrew Cooper wrote:
> As it currently stands, the sending side iterates from 0 to p2m_size,
> and sends every frame on the first pass. This means we get PAGE_DATA
> records linearly, in batches of 1024, or two aligned 2M superpages.
Is there a way to preserve 1G pages? This 380G domU I'm looking at is
built with 4k:461390 2M:2341 1G:365 pages.
Was there any performance testing done with the new code? I think the
15-20% degradion we are seeing might be caused by this.
Olaf
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next prev parent reply other threads:[~2017-04-20 16:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 15:35 superpages lost after migration of HVM domU Olaf Hering
2017-04-20 15:53 ` Andrew Cooper
2017-04-20 16:04 ` Olaf Hering [this message]
2017-04-20 16:31 ` Jan Beulich
2017-04-26 15:43 ` Olaf Hering
2017-04-26 15:52 ` Andrew Cooper
2017-04-28 10:15 ` Olaf Hering
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