linux-ext4 - [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

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Message-ID: <bug-217965-13602-tfZ1grsPIF@https.bugzilla.kernel.org/>
Date: Sat, 06 Jan 2024 02:11:24 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

https://bugzilla.kernel.org/show_bug.cgi?id=217965

--- Comment #63 from Matthew Stapleton (matthew4196@...il.com) ---
I can't seem to trigger the problem now even with all the patches disabled and
/sys/fs/ext4/<dev>/mb_best_avail_max_trim_order set to the default of 3 so
unfortunately I won't be able to help with this problem for now.

According to perf record -ag sleep 5 at the moment most of the ext4 cpu usage
is in ext4_get_group_desc and ext4_get_group_info , both called from
ext4_mb_prefetch and some usage in ext4_mb_good_group called from
ext4_mb_find_good_group_avg_frag_lists .  Both ext4_mb_prefetch and
ext4_mb_find_good_group_avg_frag_lists were called from
ext4_mb_regular_allocator.  But this is all fairly low cpu usage at the moment
and it all stops shortly after the file operation is completed.

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