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

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Message-ID: <0889814a-615a-491e-86ff-aaa7b9518dec@pkm-inc.com>
Date: Wed, 13 Nov 2024 02:25:22 +0100
From: Dragan Milivojević <galileo@...-inc.com>
To: Yu Kuai <yukuai1@...weicloud.com>, "yukuai (C)" <yukuai3@...wei.com>
Cc: Song Liu <song@...nel.org>, linux-raid@...r.kernel.org,
 linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 "Luse, Paul E" <paul.e.luse@...el.com>
Subject: Re: [PATCH md-6.13] md: remove bitmap file support

On 13/11/2024 02:18, Yu Kuai wrote:
>>> ram0:            981MiB/s
>>> non-bitmap:        132MiB/s
>>> internal-bitmap:    95.5MiB/s
>>>>

> 
> So, I waited for Paul to have a chance to give it a test for real disks,
> still, results are similar to above.

That is interesting. How are you running those tests?
I should try them on my hardware as well.

> 
> You can see examples here:
> 
> https://github.com/brendangregg/FlameGraph
> 
> To be short, while test is running:
> 
> perf record -a -g -- sleep 10
> perf script -i perf.data | ./stackcollapse-perf.pl | ./flamegraph.pl
> 
> BTW, you said that you're using production environment, this will
> probably make it hard to analyze performance.

I may be able to move things around for the weekend, we will see.

Thanks
Dragan