Re: [PATCH 1/1] nilfs2: add mount option that reduces super block writes

[Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>]

On Jan 30, 2014, at 12:48 PM, Andreas Rohner wrote:

> 
> I have just finished a test with my  100 GB HDD and SSD. I filled it
> with dd until it was 100% full. Then I cut power to the machine and
> timed the following mount operation:
> 
> 100GB HDD:
> time sudo mount -o bad_ftl /dev/sda1 /mnt/
> 
> real	1m21.068s
> user	0m0.020s
> sys	0m0.770s
> 
> 100GB SSD:
> time sudo mount -o bad_ftl /dev/sdc1 /mnt/
> 
> real	0m2.124s
> user	0m0.010s
> sys	0m0.243s
> 
> So it looks quite bad for hard drives. To scan a 1 TB hard drive would
> take 13 minutes.
> 
> But a 1 TB SSD would only take 20 seconds!
> 

I think that it will be good to have comparable results for the same environment.
I mean, for example, measurement in different situations for SSD (without your
patch and this your patch). How much time do you need for scanning the whole SSD
by your approach? I think that comparison of linear scanning results for the whole
SSD drive and for sudden power-off situation can provide basis for consideration.
But sudden power-off situation can be different, I suppose.

Thanks,
Vyacheslav Dubeyko.

> I will test one of my SD cards next.
> 
> Regards,
> Andreas Rohner

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