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[209.132.180.67]) by mx.google.com with ESMTP id i15si1803188pfk.146.2018.04.24.02.27.01; Tue, 24 Apr 2018 02:27:16 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753560AbeDXJIm (ORCPT + 99 others); Tue, 24 Apr 2018 05:08:42 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:32823 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753068AbeDXJIh (ORCPT ); Tue, 24 Apr 2018 05:08:37 -0400 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 804CD2012BA059; Tue, 24 Apr 2018 11:08:34 +0200 (CEST) Subject: =?UTF-8?Q?Re:_How_to_disable_Linux_kernel_self-extraction_=28KERNEL?= =?UTF-8?B?X0daSVAsIEtFUk5FTF9CWklQMiwg4oCmKT8=?= To: Adam Borowski Cc: Pavel Machek , linux-kernel@vger.kernel.org, x86@kernel.org, Ingo Molnar References: <9468be0e-5eb9-246c-e60e-3d8019a42fd1@molgen.mpg.de> <20180422102033.GB26243@amd> <20180422205208.GA8672@amd> <20180423170230.GA22412@amd> <20180424020824.2vsddcdndjnvdm46@angband.pl> From: Paul Menzel Message-ID: Date: Tue, 24 Apr 2018 11:08:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180424020824.2vsddcdndjnvdm46@angband.pl> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms050708010705080802070600" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms050708010705080802070600 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Adam, Thank you very much to join the discussion. On 04/24/18 04:08, Adam Borowski wrote: > On Mon, Apr 23, 2018 at 07:02:30PM +0200, Pavel Machek wrote: >>>>>> I try to decrease boot time, and my system has an SSD and enough s= pace, so >>>>>> loading 18 instead of 12 MB doesn=E2=80=99t make a difference, but= the >>>>>> self-extraction is noticeable. So, I like to disable it. >>>>> >>>>> How long does GZIP extraction take on your hardware? >>>> >>>> It=E2=80=99s hard to measure =E2=80=93 at least I didn=E2=80=99t fin= d a way to do so =E2=80=93, but counting >>>> from the last GRUB message to the first message of Linux (with `quie= t` >>>> removed from the the command line), it takes roughly *two* seconds. >=20 > I took a somewhat different approach: I recorded the output from grub+k= ernel > to ttyrec over serial line, and rigged ttyrec2ansi to output timestamp > difference from the last checkpoint every time an '\e' or '\n' is seen.= > '\e' is important, as there's no other marking for when grub stops the > interactive phase and starts the actual boot. Nice work. It=E2=80=99d be great, if you shared these patches, so others = and I=20 can reproduce it. (Also, `scripts/extract-vmlinux` needs to be updated for LZ4.) > Turns out that, reading from SSD, grub is way way slower than it should= take > normally. The machine is old (AMD Phenom II X6 1055T), SSD is Crucial > CT240M500SSD1. What firmware does the device (mainboard) have? Legacy BIOS or UEFI (or=20 even coreboot ;-)). It=E2=80=99s my understanding, that GRUB does not hav= e a=20 native driver with the legacy BIOS and UEFI, and just uses the BIOS=20 calls or the UEFI equivalent. > I also have the zstd patch applied, which adds another data point. >=20 > The two "Loading XXX ..." lines come from grub, those timestamped withi= n [] > brackets from the kernel, =E2=8C=A9=E2=8C=AAare ttyrec timestamps, =E2=A4= =B8 is wrapped lines. >=20 >=20 > zstd: >=20 > Loading Linux 4.17.0-rc2-debug-00025-gd426b0ba363d ...=E2=8C=A90.739823= =E2=8C=AA > ^MLoading initial ramdisk ...=E2=8C=A90.402010=E2=8C=AA > ^M[ 0.000000] Linux version 4.17.0-rc2-debug-00025-gd426b0ba363d =E2= =A4=B8 > (kilobyte@umbar) (gcc version 7.3.0 (Debian 7.3.0-16)) #1 SMP Mon Apr 2= 3=E2=A4=B8 > 10:25:58 CEST 2018^M=E2=8C=A90.785922=E2=8C=AA > [ 0.000000] Command line: BOOT_IMAGE=3D/sys/boot/vmlinuz-4.17.0-rc2-= debug-00025-gd426b0ba363d=E2=A4=B8 > root=3DUUID=3Db7c38da9-ae84-4083-a1f8-6d7b4fc33961 ro rootflags=3Dsub= vol=3Dsys syscall.x32=3Dy=E2=A4=B8 > console=3Dtty0 console=3DttyS0,115200n8 no_console_suspend^M=E2=8C=A9= 0.020199=E2=8C=AA >=20 > gzip: >=20 > Loading Linux 4.17.0-rc2-debug-gz-00025-gd426b0ba363d ...=E2=8C=A90.724= 988=E2=8C=AA > ^MLoading initial ramdisk ...=E2=8C=A90.357951=E2=8C=AA > ^M[ 0.000000] Linux version 4.17.0-rc2-debug-gz-00025-gd426b0ba363d = =E2=A4=B8 > (kilobyte@umbar) (gcc version 7.3.0 (Debian 7.3.0-16)) #1 SMP Mon Apr 2= 3 =E2=A4=B8 > 23:15:07 CEST 2018^M=E2=8C=A90.777977=E2=8C=AA > [ 0.000000] Command line: BOOT_IMAGE=3D/sys/boot/vmlinuz-4.17.0-rc2-= debug-gz-00025-gd426b0ba363d=E2=A4=B8 > root=3DUUID=3Db7c38da9-ae84-4083-a1f8-6d7b4fc33961 ro rootflags=3Dsub= vol=3Dsys syscall.x32=3Dy=E2=A4=B8 > console=3Dtty0 console=3DttyS0,115200n8 no_console_suspend^M=E2=8C=A9= 0.020117=E2=8C=AA >=20 > lz4: >=20 > Loading Linux 4.17.0-rc2-debug-none-00025-gd426b0ba363d ...=E2=8C=A90.7= 99969=E2=8C=AA > ^MLoading initial ramdisk ...=E2=8C=A90.424959=E2=8C=AA > ^M[ 0.000000] Linux version 4.17.0-rc2-debug-lz4-00025-gd426b0ba363d= =E2=A4=B8 > (kilobyte@umbar) (gcc version 7.3.0 (Debian 7.3.0-16)) #1 SMP Tue Apr 2= 4 =E2=A4=B8 > 00:34:59 CEST 2018^M=E2=8C=A90.732925=E2=8C=AA > [ 0.000000] Command line: BOOT_IMAGE=3D/sys/boot/vmlinuz-4.17.0-rc2-= debug-lz4-00025-gd426b0ba363d=E2=A4=B8 > root=3DUUID=3Db7c38da9-ae84-4083-a1f8-6d7b4fc33961 ro rootflags=3Dsub= vol=3Dsys syscall.x32=3Dy=E2=A4=B8 > console=3Dtty0 console=3DttyS0,115200n8 no_console_suspend^M=E2=8C=A9= 0.021019=E2=8C=AA >=20 > zstd again: >=20 > Loading Linux 4.17.0-rc2-debug-00025-gd426b0ba363d ...=E2=8C=A90.728852= =E2=8C=AA > ^MLoading initial ramdisk ...=E2=8C=A90.399968=E2=8C=AA > ^M[ 0.000000] Linux version 4.17.0-rc2-debug-00025-gd426b0ba363d =E2= =A4=B8 > (kilobyte@umbar) (gcc version 7.3.0 (Debian 7.3.0-16)) #1 SMP Mon Apr 2= 3 =E2=A4=B8 > 10:25:58 CEST 2018^M=E2=8C=A90.786964=E2=8C=AA > [ 0.000000] Command line: BOOT_IMAGE=3D/sys/boot/vmlinuz-4.17.0-rc2-= debug-00025-gd426b0ba363d=E2=A4=B8 > root=3DUUID=3Db7c38da9-ae84-4083-a1f8-6d7b4fc33961 ro rootflags=3Dsub= vol=3Dsys syscall.x32=3Dy=E2=A4=B8 > console=3Dtty0 console=3DttyS0,115200n8 no_console_suspend^M=E2=8C=A9= 0.020071=E2=8C=AA >=20 > lz4 rigged for no compression: >=20 > Loading Linux 4.17.0-rc2-debug-none-00025-gd426b0ba363d-dirty ...=E2=8C= =A90.479834=E2=8C=AA > ^MLoading initial ramdisk ...=E2=8C=A92.246985=E2=8C=AA Just to be sure. The 2.2 seconds are from loading the 27 MB Linux kernel = image, right? > ^M[ 0.000000] Linux version 4.17.0-rc2-debug-none-00025-gd426b0ba363= d-dirty =E2=A4=B8 > (kilobyte@umbar) (gcc version 7.3.0 (Debian 7.3.0-16)) #5 SMP Tue Apr 2= 4 =E2=A4=B8 > 02:57:18 CEST 2018^M=E2=8C=A90.711949=E2=8C=AA > [ 0.000000] Command line: BOOT_IMAGE=3D/sys/boot/vmlinuz-4.17.0-rc2-= debug-none-00025-gd426b0ba363d-dirty=E2=A4=B8 > root=3DUUID=3Db7c38da9-ae84-4083-a1f8-6d7b4fc33961 ro rootflags=3Dsub= vol=3Dsys syscall.x32=3Dy=E2=A4=B8 > console=3Dtty0 console=3DttyS0,115200n8 no_console_suspend^M=E2=8C=A9= 0.021902=E2=8C=AA >=20 > Sizes of relevant files: >=20 > 14826134 initrd.img-4.17.0-rc2-debug-00025-gd426b0ba363d (zstd) > 14826352 initrd.img-4.17.0-rc2-debug-gz-00025-gd426b0ba363d > 14826909 initrd.img-4.17.0-rc2-debug-lz4-00025-gd426b0ba363d > 14826761 initrd.img-4.17.0-rc2-debug-none-00025-gd426b0ba363d-dirty > 6567408 vmlinuz-4.17.0-rc2-debug-00025-gd426b0ba363d (zstd) > 7230960 vmlinuz-4.17.0-rc2-debug-gz-00025-gd426b0ba363d > 8775152 vmlinuz-4.17.0-rc2-debug-lz4-00025-gd426b0ba363d > 27821552 vmlinuz-4.17.0-rc2-debug-none-00025-gd426b0ba363d-dirty > (I did not alter initrd compression, which is zstd in all cases). Does the size of the uncompressed image match the size in=20 `arch/x86/boot/compressed/vmlinux.bin`? >>> So yes, looks like uncompressed kernel image may be good idea. >=20 > Seems like the time to actually read this far bigger file from the disk= > using grub's inefficient way, takes longer than the gains from faster > decompression. You can eliminate the decompression step altogether by > avoiding copying, but it still looks like it's not a win. >=20 > I've seen u-boot taking ~60 seconds to read from a SD card, too. I could test on my coreboot systems, if GRUB is faster with the native=20 AHCI driver. > Another surprise is that zstd is a notch _slower_ than gzip (in userspa= ce > it's drastically faster for the same compression ratio), but reduced di= sk > space is still nice. It's worth investigating why it's not as fast as = it > should be. Maybe that should be done in a separate thread. I=E2=80=99ll split it out= =2E >> Actually... Compressors usually have a mode when they store the data >> uncompressed. So you should be able to prepare .gz image which is not >> really compressed inside, and thus really fast to uncompress. >=20 > I can't seem to find any. IIRC xz format can store uncompressed blocks= but > the tool doesn't appear to expose this as an option. >=20 >> Or maybe even better -- there should be some compression algorithms >> that are fast enough to uncompress that there should be no >> slowdown. Maybe use one of those? >=20 > Perhaps my method is totally wrong, but differences in decompression sp= eed > are surprisingly small, dwarfed by whatever else the kernel does betwee= n > messages. >=20 > I did not test xz, nor ran tests more than once, but it's 4am so these = are > things to do tomorrow. It=E2=80=99d be interesting to find out, what is happening in the first 7= 00 ms,=20 before the first Linux message is transmitted over serial line. It could = be, that the serial line affects the time stamps for example, or takes=20 so long to set up the serial console. Kind regards, Paul --------------ms050708010705080802070600 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT AkRFMSswKQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYD VQQLDBZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFs Um9vdCBDbGFzcyAyMB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNV BAYTAkRFMUUwQwYDVQQKEzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVu IEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERG Ti1WZXJlaW4gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkgMjCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAMtg1/9moUHN0vqHl4pzq5lN6mc5WqFggEcVToyVsuXPztNXS43O+FZs FVV2B+pG/cgDRWM+cNSrVICxI5y+NyipCf8FXRgPxJiZN7Mg9mZ4F4fCnQ7MSjLnFp2uDo0p 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