Re: nvme+btrfs+compression sensibility and benchmark

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Thank you, all

Though the info is useful, there's not a clear consensus on what I should expect. For interest's sake, I'll post benchmarks from the device itself when it arrives.

I'm expecting at least that I'll be blown away :)

On 04/18/2018 09:23 PM, Chris Murphy wrote:


On Wed, Apr 18, 2018 at 10:38 AM, Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx <mailto:ahferroin7@xxxxxxxxx>> wrote:

    For reference, the zstd compression in BTRFS uses level 3 by default
    (as does zlib compression IIRC), though I'm not sure about lzop (I
    think it uses the lowest compression setting).



The user space tool, zstd, does default to 3, according to its man page.

        -#     # compression level [1-19] (default: 3)


However, the kernel is claiming it's level 0, which doesn't exist in the man page. So I have no idea what we're using. This is what I get with mount option compress=zstd

[    4.097858] BTRFS info (device nvme0n1p9): use zstd compression, level 0




--
Chris Murphy
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