linux-kernel - Re: [PATCH md-6.13] md: remove bitmap file support

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Message-ID: <CALtW_ai-xfkphuch64f2n544cfWzg__59bwX3Yxkf-N61K-SvA@mail.gmail.com>
Date: Sat, 9 Nov 2024 03:15:25 +0100
From: Dragan Milivojević <galileo@...-inc.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Song Liu <song@...nel.org>, linux-raid@...r.kernel.org, 
	linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com, 
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH md-6.13] md: remove bitmap file support

On Sat, 9 Nov 2024 at 02:44, Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> This is not what I expected, can you give the tests procedures in
> details? Including test machine, create the array and test scrpits.

Server is Dell PowerEdge R7525, 2x AMD EPYC 7313 the rest
is in the linked pastebin, let me know if you need more info.

BTW do you guys do performance tests? All of the raid levels are
practically broken performance wise. None of them scale. Looking forward
to seeing those patches from Shushu Yi included, anyone knows when those
will be shipped?

> Bitmap file will be removed, the way it's implemented is problematic. If
> you have plans to upgrade kernel to v6.13+, I can keep it for now,
> untill the other lockless bitmap is ready.

I usually use distro kernels so no such plan for now, just thought it would
be useful to ship both at the same time. Soften the blow for those using
external bitmaps.