linux-ext4 - Re: [PATCH 9/9] common/attr: Reduce MAX_ATTRS to leave some overhead for 64K blocksize

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Date:   Wed, 30 Jun 2021 08:51:50 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 9/9] common/attr: Reduce MAX_ATTRS to leave some overhead
 for 64K blocksize

On Mon, Jun 14, 2021 at 11:58:13AM +0530, Ritesh Harjani wrote:
> Test generic/020 fails for ext4 with 64K blocksize. So increase some overhead
> value to reduce the MAX_ATTRS so that it can accomodate for 64K blocksize.
> 
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> ---
>  common/attr | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/common/attr b/common/attr
> index d3902346..e8661d80 100644
> --- a/common/attr
> +++ b/common/attr
> @@ -260,7 +260,7 @@ xfs|udf|pvfs2|9p|ceph|nfs)
>  	# Assume max ~1 block of attrs
>  	BLOCK_SIZE=`_get_block_size $TEST_DIR`
>  	# user.attribute_XXX="value.XXX" is about 32 bytes; leave some overhead
> -	let MAX_ATTRS=$BLOCK_SIZE/40
> +	let MAX_ATTRS=$BLOCK_SIZE/48

50% is quite a lot of overhead; maybe we should special-case this?

--D

>  esac
>  
>  export MAX_ATTRS
> -- 
> 2.31.1
>