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From: "Jorg Bornschein" <jb@capsec.org>
Subject: Re: Very slow balance / btrfs-transaction
To: "Qu Wenruo" <quwenruo@cn.fujitsu.com>,
        "Goldwyn Rodrigues" <rgoldwyn@suse.de>, linux-btrfs@vger.kernel.org
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February 6, 2017 1:45 AM, "Qu Wenruo" <quwenruo@cn.fujitsu.com> 

> Would you please provide the kernel version?
> 
> v4.9 introduced a bad fix for qgroup balance, which doesn't completely fix qgroup bytes leaking,
> but also hugely slow down the balance process:
>

I'm a bit behind the times: 4.8.13-1-ARCH



   j