linux-ext4 - Re: [PATCH v4 0/3] dioread

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Date:	Fri, 15 Jan 2010 13:47:26 -0800
From:	Michael Rubin <mrubin@...gle.com>
To:	Eric Sandeen <sandeen@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>
Cc:	tytso@....edu, Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v4 0/3] dioread_nolock patch

On Fri, Jan 15, 2010 at 12:17 PM, Eric Sandeen <sandeen@...hat.com> wrote:
> tytso@....edu wrote:
> At one point google was planning to devise a power-fail test
> harness.  Any news on that?

We completed the tests. But there is good news and bad news. The good
news is that we were able to shake out a lot of bugs in the no journal
case (which have already been submitted upstream). We now can fairly
quickly and easily drive a lot of traffic to a system and then cut the
power, issue a panic or other event.

The bad news is that I was hoping to use open source tools to drive
the traffic. The goal would be to allow everyone to reproduce the
experiment. We got a little short handed on resources and ended up
using Google closed source workloads instead. This was mostly since we
were in a rush and able to get the network traffic up in one day with
those tools.

I was holding back on publishing the results since I was hoping we
would be able to generate traffic in a more open manner. But if you
are interested in the results anyway then give me or some one on the
team a day or two to dig them up.

In any case we have powerfail testing as part of our validation and
once Jiayingz is satisfied with the patch we will be running those
tests.

mrubin
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