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0d13f5343f
freebsd-dev/stand
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Maxim Sobolev 0d13f5343f Only trigger read-ahead if two adjacent blocks have been requested. 
The change makes block caching algorithm to work better for remote
media on low-BW/high-delay links.

This cuts boot time over IP KVMs noticeably, since the initialization
stage reads bunch of small 4th (and now lua) files that are not in
the same cache stripe (usually), thus wasting lot of bandwidth and
increasing latency even further.

The original regression came in 2017 with revision 87ed2b7f5. We've
seen increase of time it takes for the loader to get to the kernel
loading from under a minute to 10-15 minutes in many cases.

Reviewed by:	tsoome
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D31623
2021-08-20 14:08:01 -07:00
..
arm Remove obsolete code gated on _ARM_ARCH_* 2021-01-28 10:41:45 +00:00
arm64 No need to make objects here. 2018-04-27 22:15:18 +00:00
common Only trigger read-ahead if two adjacent blocks have been requested. 2021-08-20 14:08:01 -07:00
defaults loader.conf(5): mention "efi" option for "console" parameter 2021-08-01 06:41:49 +08:00
efi amd64 UEFI loader: stop copying staging area to 2M physical 2021-08-08 22:52:29 +03:00
fdt loader: Fix dtb loading 2021-07-05 15:53:08 +02:00
ficl loader: implement framebuffer console 2021-01-02 21:41:36 +02:00
ficl32 Enable veriexec for loader 2019-02-26 06:22:10 +00:00
fonts loader: really use bold font for vga text mode 2021-01-08 01:24:30 +02:00
forth loader: support.4th resets the read buffer incorrectly 2021-07-28 13:50:38 -06:00
i386 Fix a few typos in source code comments 2021-08-14 09:06:09 +02:00
images loader: implement framebuffer console 2021-01-02 21:41:36 +02:00
kshim Fix build of stand/usb . 2021-04-12 16:13:33 +02:00
liblua EFI secure boot VECTX related changes 2021-04-30 12:53:45 -05:00
liblua32 Add Lua as a scripting langauge to /boot/loader 2018-02-12 15:31:53 +00:00
libofw Fix 64-bit build of libofw. 2020-09-08 23:22:11 +00:00
libsa libsa: cstyle cleanup of dosfs.c 2021-08-19 17:36:25 +03:00
libsa32 Enable veriexec for loader 2019-02-26 06:22:10 +00:00
lua cli.lua.8: make the command match the code 2021-07-28 20:54:14 -06:00
man loader: Create loader_simp(8) to document simple version of loader 2021-07-14 16:59:51 -06:00
mips Disable PIE for MIPS BERI boot loader 2021-02-25 06:41:35 +01:00
powerpc Disable PIE for powerpc bootloaders. 2021-02-25 00:26:11 +01:00
uboot loader: fix uboot build with gfx_fb 2021-01-03 20:45:37 +02:00
usb Fix build of stand/usb . 2020-01-23 10:40:34 +00:00
userboot loader: cstyle cleanup of userboot/devicename.c 2021-08-11 10:13:46 +03:00
defs.mk stand: Add MK_PIE=no to defs.mk 2021-08-11 11:03:19 -06:00
fdt.mk
ficl.mk EFI secure boot VECTX related changes 2021-04-30 12:53:45 -05:00
loader.mk stand/common: Add support for timestamp logging (tslog) 2021-06-20 20:09:43 -07:00
lua.mk Do not include float interfaces when using libsa. 2018-02-23 04:04:25 +00:00
Makefile stand: ensure that the efi directory's dependencies are correct 2021-01-27 13:02:51 -06:00
Makefile.amd64 stand: properly declare subdir deps or .WAIT, do parallel build 2020-12-31 11:15:45 -06:00
Makefile.inc stand: properly declare subdir deps or .WAIT, do parallel build 2020-12-31 11:15:45 -06:00
uboot.mk Unify metadata load files for arm, mips, powerpc, sparc64 2018-02-13 03:44:50 +00:00
veriexec.mk EFI secure boot VECTX related changes 2021-04-30 12:53:45 -05:00