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Re: [Qemu-devel] [Qemu-block] [PATCH v3 0/9] ahci: enable migration

From: John Snow
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v3 0/9] ahci: enable migration
Date: Mon, 04 May 2015 11:40:04 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 05/04/2015 08:29 AM, Kevin Wolf wrote:
Am 30.04.2015 um 20:07 hat John Snow geschrieben:
The day we all feared is here, and I am proposing we allow the migration
of the AHCI device tentatively for the 2.4 development window.

There are some more NCQ migration tests are needed, but I felt that it was
important to get migration enabled as close to the start of the 2.4
development window as possible.

If the NCQ patches don't pan out by the time the 2.4 freeze occurs, we can
revert the migration boolean and add a conditional around the ahci tests
that rely on the migration feature being enabled.

I am justifying this checkin based on a series of ping-pong
migration tests I ran under heavy load (using google's stressapptest)
and saw over 300 successful migrations without a single failure.

This series does a few things:
(1) Add migration facilities to libqos
(2) Enable AHCI and ICH9 migration
(3) Add a series of migration tests to ahci-test

Reviewed-by: Kevin Wolf <address@hidden>

I think besides the NCQ tests, we'll definitely also want to test
migration with READ DMA in flight (this series tests only WRITE DMA and
FLUSH CACHE). Probably also discard.

Added to the todo list, thanks.

Nice to have, but less important, would be the other variants that
exist, like the EXT version of each command, and READ/WRITE SECTOR.

But all of that can be added in a follow-up series, it's not a reason to
hold up what's already there.




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