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>
[-- Attachment #1.1: Type: text/plain, Size: 500 bytes --]
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
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 195 bytes --]
[-- Attachment #2: Type: text/plain, Size: 127 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170420160401.GH4645@aepfle.de \
--to=olaf@aepfle.de \
--cc=andrew.cooper3@citrix.com \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).