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From: Qu Wenruo <quwenruo.btrfs@gmx.com>
To: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: [REGRESSION] Super slow balance in v5.0-rc1
Date: Mon, 14 Jan 2019 13:39:46 +0800	[thread overview]
Message-ID: <f26305c2-3c8f-6d16-f414-636e5548851e@gmx.com> (raw)


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Hi,

When rebasing my qgroup + balance optimization patches, I found one very
obvious performance regression for balance.

For normal 4G subvolume, 16 snapshots, balance workload, v4.20 kernel
only takes 3s to relocate a metadata block group, while for v5.0-rc1, I
don't really know how it will take as it hasn't finished yet.

And the most important part is, this happens when quota is *DISABLED*!!!

I'm bisecting for this regression, but if there are some users trying
latest rc kernel, please be aware of this regression.

Thanks,
Qu


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             reply	other threads:[~2019-01-14  5:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-14  5:39 Qu Wenruo [this message]
2019-01-14  9:35 ` [REGRESSION] Super slow balance in v5.0-rc1 David Sterba
2019-01-14 10:00   ` Qu Wenruo
2019-01-14 11:47 Tomasz Chmielewski
2019-01-14 12:34 ` Qu Wenruo
2019-01-14 13:06   ` Tomasz Chmielewski

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