linux-kernel - Re: [PATCH v2] bcache: add the deferred_flush IO processing path in the writeback mode

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Message-Id: <19FD6A47-11AA-4C76-B5B6-98BB84971D16@coly.li>
Date: Mon, 26 May 2025 17:44:31 +0800
From: Coly Li <i@...y.li>
To: Zhou Jifeng <zhoujifeng@...inos.com.cn>
Cc: Coly Li <colyli@...nel.org>,
 邓旺波 <dengwangbo@...inos.com.cn>,
 "kent.overstreet" <kent.overstreet@...ux.dev>,
 linux-bcache <linux-bcache@...r.kernel.org>,
 linux-kernel <linux-kernel@...r.kernel.org>,
 夏华 <xiahua@...inos.com.cn>
Subject: Re: [PATCH v2] bcache: add the deferred_flush IO processing path in
 the writeback mode



> 2025年5月26日 17:42，Zhou Jifeng <zhoujifeng@...inos.com.cn> 写道：
> 
> On Mon, 26 May 2025 at 15:42, Coly Li <i@...y.li> wrote:
>> 
>> Hi Jifeng,
>> 
>>> 2025年5月26日 14:41，Zhou Jifeng <zhoujifeng@...inos.com.cn> 写道：
>>> 
>>> On Mon, 28 Apr 2025 at 15:36, Zhou Jifeng <zhoujifeng@...inos.com.cn> wrote:
>>> .....
>>>> v1->v2: Version v2 mainly addresses the issue of low efficiency in
>>>> writing back dirty data in version v1. When writing back dirty data,
>>>> it no longer uses the FUA method but instead writes back no more than
>>>> 500 dirty bkeys and then uniformly sends a PREFLUSH instruction once.
>>>> I will supplement more test data later.
>>> .....
>>> 
>>> Comparison test data::
>>> https://github.com/jifengzhou/file/blob/main/bcache-deferred-patch-correlation-data.pdf
>>> 
>> 
>> Can I access the raw data to have a look?
>> 
>> And the three different testings, which parameters of bcache are modified from default?
>> 
>> Thank.
>> 
>> 
>> Coly Li
> 
> Test raw data address:
> https://github.com/jifengzhou/file/tree/main/deferred%20test%20data
> 
> I have not learned the default values of the parameters in the configuration file. Generally, they are 
> configured according to the required characteristics, such as random IO, sequential IO, block size, etc.
> The only difference between the first and second test parameters is openflags. The difference between 
> the third test and the first two groups is openflags, xfersize, and seekpct. The xfersize parameter is 
> used to control the access block size, and the seekpct parameter is used to control the random ratio. 0 
> represents complete order and 100 represents 100% random.

Copied. Because the data lines from chats are too closed, I need to read them more close.

Thanks.

Coly Li