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SubjectRe: 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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