From: Mario Smarduch <m.smarduch@samsung.com>
To: kvm-ia64@vger.kernel.org
Subject: Re: [PATCH v12 0/6] arm/KVM: dirty page logging support for ARMv7 (3.17.0-rc1)
Date: Tue, 28 Oct 2014 00:28:28 +0000 [thread overview]
Message-ID: <544EE32C.3060701@samsung.com> (raw)
In-Reply-To: <1414017251-5772-1-git-send-email-m.smarduch@samsung.com>
Hi Wanpeng,
On 10/27/2014 04:26 PM, Wanpeng Li wrote:
[...]
>>
>> Testing:
>> - Generally live migration + checksumming of source/destination memory regions
>> is used validate correctness.
>
> Could you tell me where to get the checksum you are using? In addition,
> checksum should be used at which point of live migration?
>
> Regards,
> Wanpeng Li
qemu in https://github.com/mjsmar/arm-dirtylog-tests/tree/master/v7/test
is instrumented to save the guest ram on source and destination.
On source it dumps ram to file (ramimage0) from ram VMHandler
save_live_complete, right after source has stopped iterating and
remaining memory (and other VM state) to transfer is within
downtime threshold (about 70-90mS).
On destination guest ram is dumped to file qemu_loadvm_state() just
before the guest is started.
It works for 'machvirt' and 'VExpress' machine models, the start
addresses are hardcoded while walking ram_list searching for a matching
RAMBlock.
Unless you have armv7 hardware I'm not sure how you can reproduce
it, it may be possible on Fast Models but I have not tried it, most
likely it would be extremely slow.
- Mario
>
>> - qemu machvirt, VExpress - Exynos 5440, FastModels - lmbench + dirty guest
>> memory cycling.
>> - ARMv8 Foundation Model/kvmtool - Due to slight overlap in 2nd stage handlers
>> did a basic bringup using qemu.
>> - x86_64 qemu default machine model, tested migration on HP Z620, tested
>> convergence for several dirty page rates
>>
>> See https://github.com/mjsmar/arm-dirtylog-tests
>> - Dirtlogtest-setup.pdf for ARMv7
>> - https://github.com/mjsmar/arm-dirtylog-tests/tree/master/v7 - README
>>
[...]
>>
>> --
>> 1.7.9.5
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe kvm" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2014-10-28 0:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-22 22:34 [PATCH v12 0/6] arm/KVM: dirty page logging support for ARMv7 (3.17.0-rc1) Mario Smarduch
2014-10-27 23:26 ` Wanpeng Li
2014-10-28 0:28 ` Mario Smarduch [this message]
2014-10-28 1:24 ` Wanpeng Li
2014-10-28 16:15 ` Mario Smarduch
2014-10-30 12:11 ` Christian Borntraeger
2014-10-30 19:27 ` Mario Smarduch
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=544EE32C.3060701@samsung.com \
--to=m.smarduch@samsung.com \
--cc=kvm-ia64@vger.kernel.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