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

[Mark Lord]

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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