5 Matching Annotations
  1. Oct 2020
    1. Linux Memory Management at Scale

      "we had to build a complete and compliant operating system in order to perform resource control reliably"

      epic real-talk. the only people on the planet who seemed to have tamed linux for workloads. controlling memory. taming io. being on the bleeding edge, it turns out, is almost entirely about forward-progress. what can we reclaim?

      • oomd for memory protection
      • fbtax2
      • psi monitoring for io regulation
      • cgroups v2


  2. Dec 2019
    1. In BTRFS mode, snapshots are taken using the in-built features of the BTRFS filesystem. BTRFS snapshots are supported only on BTRFS systems having an Ubuntu-type subvolume layout (with @ and @home subvolumes).
  3. Dec 2018
  4. Jun 2017
    1. zfsembedsdatadirectlyinalogentry.Forlargeval-ues,itwritesdatatodiskredirect-on-write,andstoresapointerinthelog[21].Thisgiveszfsfastdurabilityforsmallwritesbyflushingthelog,avoidstheoverheadofwritinglargevaluestwice,andretainstherecoveryse-manticsofdatajournaling.Ontheotherhand,btrfs[26]usesindirectionforallwrites,regardlessofsize.Itwritesdatatonewly-allocatedblocks,andrecordsthosewriteswithpointersinitsjournal
  5. Nov 2014
    1. several filesystems show performance improvements including XFS and Btrfs

      Now using btrfs on my notebook. Works fine!

      One of the reasons for using it (from btrfs.wiki.kernel.org):

      "SSD (Flash storage) awareness (TRIM/Discard for reporting free blocks for reuse) and optimizations (e.g. avoiding unnecessary seek optimizations, sending writes in clusters, even if they are from unrelated files. This results in larger write operations and faster write throughput)"

      Since btrfs once ate my data (pre 1.0) I did several crash simulations to boost my confidence beforehand.