linux-ext4 - Re: [PATCH] ext4: disable mount with both dioread

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Date:   Mon, 9 Sep 2019 11:40:34 +0800
From:   Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: disable mount with both dioread_nolock and
 nodelalloc

hi,

> On Wed, Jul 31, 2019 at 09:06:00PM +0800, Xiaoguang Wang wrote:
>> Mount with both dioread_nolock and nodelalloc will result in huge
>> performance drop, which indeed is an known issue, so before we fix
>> this issue, currently we disable this behaviour. Below test reproducer
>> can reveal this performance drop.
> 
> Is it really worth it to disable this combination?  Nothing goes
> *wrong* per se; it's just slower than we would like.
Yes, agree, then should we have some places to record this issue? In case
somebody looks into it again.

Regards,
Xiaoguang Wang

> 
> 	    	     	  	      	 - Ted
>