linux-kernel - Re: [linus:master] [btrfs] 52bb7a2166: filebench.sum

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Date:   Tue, 2 May 2023 18:27:20 +0200
From:   David Sterba <dsterba@...e.cz>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Boris Burkov <boris@....io>, oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org, David Sterba <dsterba@...e.com>,
        linux-btrfs@...r.kernel.org, ying.huang@...el.com,
        feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [linus:master] [btrfs]  52bb7a2166:  filebench.sum_operations/s
 -4.0% regression

On Sat, Apr 29, 2023 at 10:29:00PM +0800, kernel test robot wrote:
> 
> Hello,
> 
> kernel test robot noticed a -4.0% regression of filebench.sum_operations/s on:
> 
> 
> commit: 52bb7a2166af490317ce2cca1865b6630e86aca8 ("btrfs: introduce size class to block group allocator")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

The size classes are a heuristic, it may improve and worsen some
workloads and also depends on actual layout of extents and block groups.
So this is expected, -4% is within acceptable range.