linux-ext4 - Re: [PATCH 1/1] Allow ext4 to run without a journal.

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Message-ID: <6601abe90812181029r626e6ed4n4c8500e42f88a101@mail.gmail.com>
Date:	Thu, 18 Dec 2008 10:29:21 -0800
From:	Curt Wohlgemuth <curtw@...gle.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/1] Allow ext4 to run without a journal.

I should be able to post some numbers we're seeing for compilebench on
various filesystems next week, including ext4 without a journal
(Frank's patch).

Curt

On Thu, Dec 18, 2008 at 10:13 AM, Michael Rubin <mrubin@...gle.com> wrote:
> On Thu, Dec 18, 2008 at 10:00 AM, Jan Kara <jack@...e.cz> wrote:
>>  Interesting although I'm not that surprised because those tests seem
>> to do a lot of data changes (which are never journaled in fact) and tiny
>> amount of metadata changes. If you run some benchmark doing lots of
>> directory operations, I guess the numbers would be considerably
>> different.
>
> Actually we have some compile bench numbers (coming to this list soon)
> that also surprised us.
> The stages of compile bench that I believe are dominated by directory
> operations are also
> showing improvements without the journal.
>
>> Maybe trying dbench (I know it's kind of stupid ;) or
>> postmark will show the differences better.
>
> I admit also we see huge variance using dbench on subsequent runs. To
> the point where I don't know how much I trust it's numbers.
> Is this a tool that people on this list have a lot of faith in?
>
> mrubin
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