From: Ryusuke Konishi <konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
To: dexen.devries-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: linux-nilfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Split some metadata onto separate device?
Date: Wed, 08 Jun 2011 21:58:03 +0900 (JST) [thread overview]
Message-ID: <20110608.215803.224753719.ryusuke@osrg.net> (raw)
In-Reply-To: <20110608.214852.237935973.ryusuke-sG5X7nlA6pw@public.gmane.org>
On Wed, 08 Jun 2011 21:48:52 +0900 (JST), Ryusuke Konishi wrote:
> On Fri, 3 Jun 2011 19:42:28 +0200, dexen deVries wrote:
> > By the way, it seems to me that the in-kernel GC does not attempt to
> > de- fragment files. Is that the case? If so, would probably mean
> > extents would not help very much for fragmented files. Also, on
> > magnetic media, a lot of seeking happens in case of fragmented
> > files.
>
> Yes, but extents will decrease the amount of metadata, and this has
> potential for speed up.
>
> NILFS2 uses 32 bytes metadata per disk block at present. I guess you
> know that the number of DAT blocks are actually indispensable through
> analysis using the dumpseg tool.
Oh, looks confusing. I meant the amount of DAT blocks is not
negligible.
Regards,
Ryusuke Konishi
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next prev parent reply other threads:[~2011-06-08 12:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-03 10:29 Split some metadata onto separate device? dexen deVries
[not found] ` <201106031229.38758.dexen.devries-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-06-03 17:26 ` Ryusuke Konishi
[not found] ` <20110604.022621.01482278.ryusuke-sG5X7nlA6pw@public.gmane.org>
2011-06-03 17:42 ` dexen deVries
[not found] ` <201106031942.29133.dexen.devries-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-06-08 12:48 ` Ryusuke Konishi
[not found] ` <20110608.214852.237935973.ryusuke-sG5X7nlA6pw@public.gmane.org>
2011-06-08 12:58 ` Ryusuke Konishi [this message]
[not found] ` <20110608.215803.224753719.ryusuke-sG5X7nlA6pw@public.gmane.org>
2011-06-08 13:08 ` dexen deVries
[not found] ` <201106081508.39345.dexen.devries-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-06-08 13:49 ` Ryusuke Konishi
[not found] ` <20110608.224906.85409768.ryusuke-sG5X7nlA6pw@public.gmane.org>
2011-06-14 11:18 ` Reinoud Zandijk
[not found] ` <20110614111852.GA1263-bVHBekiX4bNgoMqBc1r0ESegHCQxtGRMHZ5vskTnxNA@public.gmane.org>
2011-06-14 13:18 ` Ryusuke Konishi
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