Re: [PATCH 4/4] xfs/216 xfs/217 Use default -l conccurency=0 on mkfs.xfs that supports it

[Lukas Herbolt <lukas@herbolt.com>]

On 2026-04-30 18:36, Darrick J. Wong wrote:
> On Thu, Apr 30, 2026 at 03:13:22PM +0200, Lukas Herbolt wrote:
>> The XFS conccurency optimalization breaks the log sizing check on
> 
> "concurrency optimization"
> 
>> systems with non-rotational disks and high amount of CPUs. Default to
>> the old behavior with -l conccurency=0 and with -d concurrency=0.
> 
> "-l concurrency=0"
> 
>> Signed-off-by: Lukas Herbolt <lukas@herbolt.com>
>> ---
>>  tests/xfs/216 |  9 +++++++--
>>  tests/xfs/217 | 17 +++++++++++++++--
>>  2 files changed, 22 insertions(+), 4 deletions(-)
>> 
>> diff --git a/tests/xfs/216 b/tests/xfs/216
>> index 091c11d08642..8b4610d5a0a6 100755
>> --- a/tests/xfs/216
>> +++ b/tests/xfs/216
>> @@ -21,14 +21,19 @@ _cleanup()
>>  }
>> 
>>  _require_scratch
>> -_scratch_mkfs_xfs >/dev/null 2>&1
>> +if _scratch_mkfs_supports_concurrency -l >> $seqres.full 2>&1; then
>> +	_scratch_mkfs_xfs -l concurrency=0 >/dev/null 2>&1
>> +	loop_mkfs_opts="-l concurrency=0"
>> +else
>> +	_scratch_mkfs_xfs >/dev/null 2>&1
>> +	loop_mkfs_opts=
>> +fi
>>  _scratch_mount
>> 
>>  _require_loop
>>  LOOP_IMG=$SCRATCH_MNT/test_fs
>>  LOOP_MNT=$SCRATCH_MNT/test_fs_dir
>> 
>> -loop_mkfs_opts=
>>  $MKFS_XFS_PROG 2>&1 | grep -q rmapbt && \
>>  	loop_mkfs_opts="$loop_mkfs_opts -m rmapbt=0"
>>  $MKFS_XFS_PROG 2>&1 | grep -q reflink && \
>> diff --git a/tests/xfs/217 b/tests/xfs/217
>> index dae6ce55f475..7c7b33b1ccf7 100755
>> --- a/tests/xfs/217
>> +++ b/tests/xfs/217
>> @@ -20,7 +20,20 @@ _cleanup()
>>  }
>> 
>>  _require_scratch
>> -_scratch_mkfs_xfs >/dev/null 2>&1
>> +if _scratch_mkfs_supports_concurrency -l >> $seqres.full 2>&1; then
>> +	_scratch_mkfs_xfs -l concurrency=0 >/dev/null 2>&1
> 
> Why does the scratch fs need a -lconcurrency option?
Yeah right it does not need it. Wanted to be sure we do not run into
-ENOSPC but on recommended 10G SCRATCH_DEV we should not.

> 
>> +	loop_mkfs_opts="-l concurrency=0"
>> +		if _scratch_mkfs_supports_concurrency -d >> $seqres.full 2>&1; then
>> +			# We could go just with -l concurency but then on 512CPUs
>> +			# it gives log size off by one block so better to set
>> +			# -d concurrency to 0.
>> +			loop_mkfs_opts="$loop_mkfs_opts -d concurrency=0"
> 
> concurrency= was added for -d and -l in the same release (6.7) so you
> don't have to test them separately.
Just wanted to be sure as those still came in different commits.
> 
> --D
> 
>> +
>> +		fi
>> +else
>> +	_scratch_mkfs_xfs >/dev/null 2>&1
>> +	loop_mkfs_opts=
>> +fi
>>  _scratch_mount
>>  # 16T mkfs requires a bit over 2G free
>>  _require_fs_space $SCRATCH_MNT 2202000
>> @@ -34,7 +47,7 @@ _do_mkfs()
>>  	for i in $*; do
>>  		echo -n "fssize=${i}g "
>>  		$MKFS_XFS_PROG -f -b size=4096 -l version=2 \
>> -			-d size=${i}g $loop_dev |grep log
>> +			-d size=${i}g $loop_dev $loop_mkfs_opts |grep log
>>  		_mount $loop_dev $LOOP_MNT
>>  		echo "test write" > $LOOP_MNT/test
>>  		_unmount $LOOP_MNT > /dev/null 2>&1
>> --
>> 2.53.0
>> 
>> 

-- 
-lhe