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

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Message-ID: <20111216051609.GA4502@localhost>
Date:	Fri, 16 Dec 2011 13:16:09 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Dave Chinner <david@...morbit.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 12:25:08PM +0800, Dave Chinner wrote:
> 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?

Nope. Shall ENOSPC (performance) be tested?

> >                 10829.00        +4.3%     11296.00  TOTAL xfs:xfs_delalloc_enospc
> 
> This implies that it does.

Not really. The USB key partition size is 7.1GB.
Even in the fastest 1dd case, only 4GB data is written:

wfg@bee /export/writeback% cat fat/UKEY-thresh=100M/xfs-1dd-1-3.2.0-rc3/ls-files 
131 -rw-rw-r-- 1 root root 4060078080 Dec  8 15:57 /fs/sdb3/zero-1

That's about 6.7MB/s write bandwidth running for 600 seconds.

Thanks,
Fengguang
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