linux-kernel - Re: Recent kernel "mount" slow

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Message-ID: <CAAJw_ZuJXnAz1ukBwQa3xNbQaL1KUBSrbQMK2hn-7D6Ar1p3fQ@mail.gmail.com>
Date:	Tue, 27 Nov 2012 13:57:17 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: Recent kernel "mount" slow

On Sun, Nov 25, 2012 at 7:23 AM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> On Sun, Nov 25, 2012 at 5:09 AM, Mikulas Patocka <mpatocka@...hat.com> wrote:
>> So it's better to slow down mount.
>
> I am quite proud of the linux boot time pitting against other OS. Even
> with 10 partitions. Linux can boot up in just a few seconds, but now
> you're saying that we need to do this semaphore check at boot up. By
> doing so, it's inducing additional 4 seconds during boot up.

By the way, I'm using a pretty fast SSD (Samsung PM830) and fast CPU
(2.8GHz). I wonder if those on slower hard disk or slower CPU, what
kind of degradation would this cause or just the same?

Thanks,
Jeff
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