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

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Date:	Fri, 22 Jan 2010 15:47:15 -0500
From:	Valerie Aurora <vaurora@...hat.com>
To:	Michael Rubin <mrubin@...gle.com>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>, 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 01:47:26PM -0800, Michael Rubin wrote:
> 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.

Don't let the perfect be the enemy of the good. :) I'd love to see
what you've got now, even if you have to leave out the closed part of it.

-VAL

> 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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