linux-kernel - Re: XFS/btrfs performance after IO-less dirty throttling

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Message-ID: <20111216042508.GE23662@dastard>
Date:	Fri, 16 Dec 2011 15:25:08 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: XFS/btrfs performance after IO-less dirty throttling

On Fri, Dec 16, 2011 at 09:53:11AM +0800, Wu Fengguang wrote:
> I'm indeed happy that you don't care that much on that regression
> introduced by me ;-)

Heh.

BTW, do these tests run to ENOSPC?

>                 10829.00        +4.3%     11296.00  TOTAL xfs:xfs_delalloc_enospc

This implies that it does.

If so, I'm not sure how much we can really trust these overall
results because allocation and writeback speeds at ENOSPC is
anything but deterministic. It will certainly have an effect
(detrimental) on throughput as the filesystem gets close to full....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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