linux-kernel - Re: [PATCH 0/8][RFC] IO latency/throughput fixes

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Message-Id: <1239137631.5638.56.camel@marge.simson.net>
Date:	Tue, 07 Apr 2009 22:53:51 +0200
From:	Mike Galbraith <efault@....de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mark Lord <lkml@....ca>, Ray Lee <ray-lk@...rabbit.org>,
	Hua Zhong <hzhong@...il.com>, Theodore Tso <tytso@....edu>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/8][RFC] IO latency/throughput fixes

On Tue, 2009-04-07 at 07:33 -0700, Linus Torvalds wrote:
> 
> On Tue, 7 Apr 2009, Mark Lord wrote:
> > 
> > What happens with ext3 "writeback", and ext4 "whatever",
> > when one does the quickie reboot method:
> > 
> >   ALT-SYSRQ-S ALT-SYSRQ-U ALT-SYSRQ-S ALT-SYSRQ-B
> > 
> > ???
> 
> Since 's' syncs (I think 'u' does too, as part of making things 
> read-only), the data blocks will be on disk after the boot regardless of 
> any other ordering.
> 
> Of course, it will leave all your lock-files files alone, and I can almost 
> guarantee that some daemons (read: "NetworkManager") will then fail on the 
> next boot because they think they are already running.

I don't do that _regularly_, but have had cause to do so many times over
the last couple years since switching to data=writeback.  Box boots up
fine here, at least with opensuse 10.3 and 11.0 it does.

I've had to reconfigure evolution, and some desktop settings a few times
after pulling the _eject_ handle (plain sysrq-b or BRB if kernel is
having a bad hair day), but that's about it.

	-Mike

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