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The Lounge War Stories Linus Torvalds reply about Meltdown and Spectre. Post 303012272 by dodona on Thursday 1st of February 2018 03:41:01 PM
Old 02-01-2018
I read that with the 4.15 Kernel with build-in patches for the hypothetical problem comes with 15-30% performance loss. Immediately I thought 'wow, Intel, AMD and the hardware pushers will earn a lot of $'. I mean todays cpu is so fast that there isn't a need for a upgrade. However the hypothetical problem with the 15-30% performance loss is the need for an upgradeSmilie. Again everything comes down to $, and nothing else than $.Smilie
 

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GIT-PACK-REFS(1)						    Git Manual							  GIT-PACK-REFS(1)

NAME
git-pack-refs - Pack heads and tags for efficient repository access SYNOPSIS
git pack-refs [--all] [--no-prune] DESCRIPTION
Traditionally, tips of branches and tags (collectively known as refs) were stored one file per ref under $GIT_DIR/refs directory. While many branch tips tend to be updated often, most tags and some branch tips are never updated. When a repository has hundreds or thousands of tags, this one-file-per-ref format both wastes storage and hurts performance. This command is used to solve the storage and performance problem by stashing the refs in a single file, $GIT_DIR/packed-refs. When a ref is missing from the traditional $GIT_DIR/refs hierarchy, it is looked up in this file and used if found. Subsequent updates to branches always create new files under $GIT_DIR/refs hierarchy. A recommended practice to deal with a repository with too many refs is to pack its refs with --all --prune once, and occasionally run git pack-refs --prune. Tags are by definition stationary and are not expected to change. Branch heads will be packed with the initial pack-refs --all, but only the currently active branch heads will become unpacked, and the next pack-refs (without --all) will leave them unpacked. OPTIONS
--all The command by default packs all tags and refs that are already packed, and leaves other refs alone. This is because branches are expected to be actively developed and packing their tips does not help performance. This option causes branch tips to be packed as well. Useful for a repository with many branches of historical interests. --no-prune The command usually removes loose refs under $GIT_DIR/refs hierarchy after packing them. This option tells it not to. AUTHOR
Written by Linus Torvalds <torvalds@osdl.org[1]> GIT
Part of the git(1) suite NOTES
1. torvalds@osdl.org mailto:torvalds@osdl.org Git 1.7.1 07/05/2010 GIT-PACK-REFS(1)
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