linux-kernel - Re: [PATCH] ubifs: Add support for zstd compression.

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Date:   Fri, 7 Jun 2019 22:49:52 +0200 (CEST)
From:   Richard Weinberger <richard@....at>
To:     Emil Lenngren <emil.lenngren@...il.com>
Cc:     linux-mtd <linux-mtd@...ts.infradead.org>,
        Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Michele Dionisio <michele.dionisio@...il.com>
Subject: Re: [PATCH] ubifs: Add support for zstd compression.

----- Ursprüngliche Mail -----
> Von: "Emil Lenngren" <emil.lenngren@...il.com>
> An: "richard" <richard@....at>
> CC: "linux-mtd" <linux-mtd@...ts.infradead.org>, "Sebastian Andrzej Siewior" <sebastian@...akpoint.cc>, "linux-kernel"
> <linux-kernel@...r.kernel.org>, "Michele Dionisio" <michele.dionisio@...il.com>
> Gesendet: Freitag, 7. Juni 2019 22:27:09
> Betreff: Re: [PATCH] ubifs: Add support for zstd compression.
>> So I'm not sure what is the best choice for the default filesystem.
> 
> My idea was at the end, i.e. it will only be used when LZO and ZLIB
> are not selected to be included for UBIFS, for example when someone
> compiles a minimal kernel who knows exactly which compression
> algorithms will be used on that system.

BTW: you can always select the compressor using the compr= mount option.
Also for the default filesystem.

Putting it at the end does not harm but IMHO the use is little.
But for the sake of completes, I agree with you. Can you send a follow-up
patch? 

> I did a single test today and compared lzo and zstd and on that test
> lzo had faster decompression speed but resulted in larger space. I'll
> do more tests later.

Can you please share more details? I'm interested what CPU this was.

Thanks,
//richard