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

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Date:	Tue, 07 Apr 2009 09:35:52 -0400
From:	Mark Lord <lkml@....ca>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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

Linus Torvalds wrote:
..
>  - If I did this right, this _only_ overrides the data mode if it's not 
>    explicitly specified on disk in the superblock mount options.
> 
> IOW, if you have done a 
> 
> 	tune2fs -o journal_data_ordered
> 
> then this will _not_ override that.
..

Thanks for saving me time to look up that command!  :)

With the stuff I work on here, kernel oops and sudden reboots
are not at all uncommon during development, and I really prefer
to keep "ordered" as the default on these machines for a tiny
extra margin of safety.

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

???

Cheers
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