linux-ext4 - Re: [PATCH v2 0/4] quota: add project quota support

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Date:	Wed, 13 Aug 2014 10:32:31 +0800
From:	Li Xi <pkuelelixi@...il.com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"hch@...radead.org" <hch@...radead.org>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v2 0/4] quota: add project quota support

On Tue, Aug 12, 2014 at 11:35 PM, Dmitry Monakhov <dmonakhov@...nvz.org> wrote:
> I'll bet a box of "russian caviar" that AlViro will never ever allow
> to place project ID to generic inode. Because it is obviously has no
> reason for any other filesystem except xfs/ext4.
Yeah, understood. Maybe the discription is misleading. I added a
field of project ID in ext4_inode structure. The general ext4 inode
structure is not changed.
>
> BTW. Which quota options you use for performance testing? It looks like
> you use non-journaled quota. But this means that you have to fully
> recalculate quota in case of power failure. It is reasonable to enable
> journaled-quota, but it result in visible journaling overhead.
Yeah, we were using non-journaled quota. And we were doing this
benchmark to confirm that xattr based implementation has extra
overhead. We will run benchmarks on journaled-quota, and let's see
what is the performance difference between non-journaled and
journaled quotas.

Regards,
                                                  -Li Xi
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