linux-ext4 - Re: libext2fs: mkfs.ext3 really slow on centos 8.2

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Date:   Thu, 13 Aug 2020 01:14:01 +0200
From:   Reindl Harald <h.reindl@...lounge.net>
To:     Andreas Dilger <adilger@...ger.ca>,
        Maciej Jablonski <mafjmafj@...il.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: libext2fs: mkfs.ext3 really slow on centos 8.2



Am 13.08.20 um 00:45 schrieb Andreas Dilger:
> On Aug 10, 2020, at 6:37 AM, Maciej Jablonski <mafjmafj@...il.com> wrote:
>> On upgrading from centos 7.6 to centos 8.2 mkfs slowed down by orders
>> of magnitude.
>>
>> e.g. 35GB partition from under 8s to 4m+ on the same host.
>>
>> Most time is spent on writing the journal to the disk.
>>
>> strace shows the following:
>>
>> We have got strace which shows that each each block is zeroed with
>> fallocate and each
>> invocation of fallocate takes 10ms, this accumulates of course.
> 
> Do you really need to use mkfs.ext3, or can you use mkfs.ext4 and
> mount the filesystem as type ext4?  Then you can use the "flexbg"
> feature and it will not only speed up mkfs but also many other
> normal operations (e.g. mount, e2fsck, allocation, etc)

typo: it's "flex_bg" and enabled by default (Filesystem created: Sun Aug
 9 13:24:15 2020)

Filesystem features: has_journal ext_attr resize_inode dir_index
filetype needs_recovery extent 64bit flex_bg sparse_super large_file
huge_file dir_nlink extra_isize metadata_csum

ext3 is something of the past for a full decade now