linux-kernel - Re: [PATCH v3 3/8] lib: add zstd support to decompress

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Date:   Thu, 26 Mar 2020 22:44:19 +0100
From:   Petr Malat <oss@...at.biz>
To:     Nick Terrell <terrelln@...com>
Cc:     Nick Terrell <nickrterrell@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Chris Mason <clm@...com>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Kernel Team <Kernel-team@...com>,
        Adam Borowski <kilobyte@...band.pl>,
        Patrick Williams <patrickw3@...com>,
        Michael van der Westhuizen <rmikey@...com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        Patrick Williams <patrick@...cx.xyz>
Subject: Re: [PATCH v3 3/8] lib: add zstd support to decompress

On Thu, Mar 26, 2020 at 09:13:54PM +0000, Nick Terrell wrote:
> >> What do you mean by that? Can you share with me the test you ran?
> >> Is this for kernel decompression or initramfs decompression?
> > Initramfs - you can apply my v2 patch on v5.5 and try with your test data.
> > 
> > I have tested your patch also on ARMv7 platform and there the degradation
> > was 8%.
> 
> Are you comparing the performance of an 8 MB window size vs a 128 MB
> window size?
No, I use the same initramfs file with 2 different kernels for the test. I have
removed
  if (params.windowSize > ZSTD_WINDOWSIZE_MAX) goto out;
from your code.
  Petr