From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Nick Terrell <nickrterrell@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Chris Mason <clm@fb.com>,
linux-kbuild <linux-kbuild@vger.kernel.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
Greg KH <gregkh@linuxfoundation.org>, Petr Malat <oss@malat.biz>,
Kees Cook <keescook@chromium.org>,
Kernel Team <Kernel-team@fb.com>,
Adam Borowski <kilobyte@angband.pl>,
Patrick Williams <patrickw3@fb.com>,
rmikey@fb.com, Ingo Molnar <mingo@kernel.org>,
Patrick Williams <patrick@stwcx.xyz>,
Sedat Dilek <sedat.dilek@gmail.com>,
Norbert Lange <nolange79@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Alex Xu <alex_y_xu@yahoo.ca>,
Masahiro Yamada <masahiroy@kernel.org>,
Nick Terrell <terrelln@fb.com>
Subject: Re: [PATCH v10 4/8] usr: add support for zstd compressed initramfs
Date: Tue, 4 Aug 2020 08:52:38 +0200 [thread overview]
Message-ID: <CAMuHMdUo5tfcEUaq4x_b9HJy25HXWmBZ3GPfqJy491zDsct5Rg@mail.gmail.com> (raw)
In-Reply-To: <20200730190841.2071656-5-nickrterrell@gmail.com>
Hi Nick,
On Thu, Jul 30, 2020 at 9:13 PM Nick Terrell <nickrterrell@gmail.com> wrote:
> From: Nick Terrell <terrelln@fb.com>
>
> * Add support for a zstd compressed initramfs.
> * Add compression for compressing built-in initramfs with zstd.
>
> I have tested this patch by boot testing with buildroot and QEMU.
> Specifically, I booted the kernel with both a zstd and gzip compressed
> initramfs, both built into the kernel and separate. I ensured that the
> correct compression algorithm was used. I tested on arm, aarch64, i386,
> and x86_64.
>
> This patch has been tested in production on aarch64 and x86_64 devices.
>
> Additionally, I have performance measurements from internal use in
> production. On an aarch64 device we saw 19 second boot time improvement
> from switching from lzma to zstd (27 seconds to 8 seconds). On an x86_64
> device we saw a 9 second boot time reduction from switching from xz to
> zstd.
>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
> Signed-off-by: Nick Terrell <terrelln@fb.com>
Thanks for your patch, which is now commit a30d8a39f0571425 ("usr: Add
support for zstd compressed initramfs").
> --- a/usr/Kconfig
> +++ b/usr/Kconfig
> @@ -100,6 +100,15 @@ config RD_LZ4
> Support loading of a LZ4 encoded initial ramdisk or cpio buffer
> If unsure, say N.
>
> +config RD_ZSTD
> + bool "Support initial ramdisk/ramfs compressed using ZSTD"
> + default y
> + depends on BLK_DEV_INITRD
> + select DECOMPRESS_ZSTD
> + help
> + Support loading of a ZSTD encoded initial ramdisk or cpio buffer.
> + If unsure, say N.
I'm aware you copied this from the other entries, but IMHO "default y",
and "If unsure, say N" are not a good combination.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2020-08-04 6:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 19:08 [GIT PULL][PATCH v10 0/8] Add support for ZSTD-compressed kernel and initramfs Nick Terrell
2020-07-30 19:08 ` [PATCH v10 1/8] lib: prepare zstd for preboot environment Nick Terrell
2020-07-30 19:08 ` [PATCH v10 2/8] lib: add zstd support to decompress Nick Terrell
2020-07-30 19:08 ` [PATCH v10 3/8] init: add support for zstd compressed kernel Nick Terrell
2020-07-30 19:08 ` [PATCH v10 4/8] usr: add support for zstd compressed initramfs Nick Terrell
2020-08-04 6:52 ` Geert Uytterhoeven [this message]
2020-08-04 7:25 ` Sedat Dilek
2020-08-04 9:19 ` Adam Borowski
2020-07-30 19:08 ` [PATCH v10 5/8] x86: bump ZO_z_extra_bytes margin for zstd Nick Terrell
2020-07-30 19:08 ` [PATCH v10 6/8] x86: Add support for ZSTD compressed kernel Nick Terrell
2020-07-30 19:08 ` [PATCH v10 7/8] .gitignore: add ZSTD-compressed files Nick Terrell
2020-07-31 9:50 ` Ingo Molnar
2020-07-31 17:17 ` Nick Terrell
2020-07-30 19:08 ` [PATCH v10 8/8] Documentation: dontdiff: Add zstd compressed files Nick Terrell
2020-07-31 9:47 ` [GIT PULL][PATCH v10 0/8] Add support for ZSTD-compressed kernel and initramfs Sedat Dilek
2020-07-31 14:36 ` Sedat Dilek
2020-08-04 6:47 ` Sedat Dilek
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