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

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Message-ID: <2132182687.85021.1559983614464.JavaMail.zimbra@nod.at>
Date:   Sat, 8 Jun 2019 10:46:54 +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 -----
> ARM Cortex-A7. The kernel is compiled with gcc 7.3.1. Next week I'll
> test some more.

Good to know!

> I have a question about how the decompression is done while reading.
> When a large file is read from the filesystem (assuming not in any
> cache), is it the case that first a chunk is read from flash, that
> chunk is then decompressed, later next chunk is read from flash, that
> one is then decompressed and so on, or can the decompression be done
> in parallel while reading the next chunk from flash?

No, this is a serial operation.

Thanks,
//richard