* Segment size
@ 2014-05-04 23:59 Paul Ni
2014-05-07 0:04 ` Jaegeuk Kim
0 siblings, 1 reply; 4+ messages in thread
From: Paul Ni @ 2014-05-04 23:59 UTC (permalink / raw)
To: linux-f2fs-devel
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Is it possible to set an arbitrary segment size? I'm trying to set it to
1.5MiB to make it align with erase blocks on flash chips in my EVO 840 SSD.
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* Re: Segment size
2014-05-04 23:59 Segment size Paul Ni
@ 2014-05-07 0:04 ` Jaegeuk Kim
2014-05-08 19:43 ` Paul Ni
0 siblings, 1 reply; 4+ messages in thread
From: Jaegeuk Kim @ 2014-05-07 0:04 UTC (permalink / raw)
To: Paul Ni; +Cc: linux-f2fs-devel
Hi,
2014-05-04 (일), 23:59 +0000, Paul Ni:
> Is it possible to set an arbitrary segment size? I'm trying to set it
> to 1.5MiB to make it align with erase blocks on flash chips in my EVO
> 840 SSD.
Impossible. The hard-coded segment size is fixed to manange the whole FS
metadata.
If you want to adjust the underlying FTL layout, you can change the
section and zone sizes.
Thanks,
>
> ------------------------------------------------------------------------------
> Is your legacy SCM system holding you back? Join Perforce May 7 to find out:
> • 3 signs your SCM is hindering your productivity
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> _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
--
Jaegeuk Kim
Samsung
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* Re: Segment size
2014-05-07 0:04 ` Jaegeuk Kim
@ 2014-05-08 19:43 ` Paul Ni
2014-05-09 0:11 ` Jaegeuk Kim
0 siblings, 1 reply; 4+ messages in thread
From: Paul Ni @ 2014-05-08 19:43 UTC (permalink / raw)
To: jaegeuk.kim; +Cc: linux-f2fs-devel
On 6 May 2014 17:04, Jaegeuk Kim <jaegeuk.kim@samsung.com> wrote:
>
> Hi,
>
> 2014-05-04 (일), 23:59 +0000, Paul Ni:
> > Is it possible to set an arbitrary segment size? I'm trying to set it
> > to 1.5MiB to make it align with erase blocks on flash chips in my EVO
> > 840 SSD.
>
> Impossible. The hard-coded segment size is fixed to manange the whole FS
> metadata.
> If you want to adjust the underlying FTL layout, you can change the
> section and zone sizes.
> Thanks,
>
> >
> > ------------------------------------------------------------------------------
> > Is your legacy SCM system holding you back? Join Perforce May 7 to find out:
> > • 3 signs your SCM is hindering your productivity
> > • Requirements for releasing software faster
> > • Expert tips and advice for migrating your SCM now
> > http://p.sf.net/sfu/perforce
> > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>
> --
> Jaegeuk Kim
> Samsung
>
Is there any other way to avoid unaligned writes to erase blocks on
TLC flash based SSDs? As far as I know, all TLC flash memory has erase
blocks sizes in multiples of 3.
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* Re: Segment size
2014-05-08 19:43 ` Paul Ni
@ 2014-05-09 0:11 ` Jaegeuk Kim
0 siblings, 0 replies; 4+ messages in thread
From: Jaegeuk Kim @ 2014-05-09 0:11 UTC (permalink / raw)
To: Paul Ni; +Cc: linux-f2fs-devel
2014-05-08 (목), 12:43 -0700, Paul Ni:
> On 6 May 2014 17:04, Jaegeuk Kim <jaegeuk.kim@samsung.com> wrote:
> >
> > Hi,
> >
> > 2014-05-04 (일), 23:59 +0000, Paul Ni:
> > > Is it possible to set an arbitrary segment size? I'm trying to set it
> > > to 1.5MiB to make it align with erase blocks on flash chips in my EVO
> > > 840 SSD.
> >
> > Impossible. The hard-coded segment size is fixed to manange the whole FS
> > metadata.
> > If you want to adjust the underlying FTL layout, you can change the
> > section and zone sizes.
> > Thanks,
> >
[...]
> Is there any other way to avoid unaligned writes to erase blocks on
> TLC flash based SSDs? As far as I know, all TLC flash memory has erase
> blocks sizes in multiples of 3.
If you want to align more precisely to the storage, you can configure
the section size in multiples of 3.
For example,
mkfs.f2fs -s 3 $DEV
-> this configures the sections consisting of 3 segments, 6MB.
Thanks,
--
Jaegeuk Kim
Samsung
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2014-05-04 23:59 Segment size Paul Ni
2014-05-07 0:04 ` Jaegeuk Kim
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2014-05-09 0:11 ` Jaegeuk Kim
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