group.of.nepali.translators team mailing list archive

[Marcelo Cerri <1812728@xxxxxxxxxxxxxxxxxx>]

Test kernel: https://kernel.ubuntu.com/~mhcerri/lp1812728_v1/

Patchset on the mailing list: https://lists.ubuntu.com/archives/kernel-
team/2019-January/098018.html

** No longer affects: linux-gcp (Ubuntu Xenial)

** Changed in: linux-gcp (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: linux-gcp (Ubuntu Bionic)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

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https://bugs.launchpad.net/bugs/1812728

Title:
  linux-gcp: Reduce boot latency due to RAID6_PQ

Status in linux-gcp package in Ubuntu:
  In Progress
Status in linux-gcp source package in Bionic:
  In Progress

Bug description:
  For an n1-standard-2 with ubuntu-1604, we spend around 600
  milliseconds during boot on computing the best raid6 recovery
  algorithm seen in the following lines of the kernel logs:

  ... 
  [ 2.216022] raid6: sse2x1 gen() 8570 MB/s 
  [ 2.264029] raid6: sse2x1 xor() 6467 MB/s 
  [ 2.312030] raid6: sse2x2 gen() 10602 MB/s 
  [ 2.360021] raid6: sse2x2 xor() 6999 MB/s 
  [ 2.412028] raid6: sse2x4 gen() 12483 MB/s 
  [ 2.464022] raid6: sse2x4 xor() 8607 MB/s 
  [ 2.516024] raid6: avx2x1 gen() 16712 MB/s 
  [ 2.568020] raid6: avx2x1 xor() 12050 MB/s 
  [ 2.620019] raid6: avx2x2 gen() 19393 MB/s 
  [ 2.672024] raid6: avx2x2 xor() 12406 MB/s 
  [ 2.724034] raid6: avx2x4 gen() 22330 MB/s 
  [ 2.776029] raid6: avx2x4 xor() 15196 MB/s 
  [ 2.780440] raid6: using algorithm avx2x4 gen() 22330 MB/s 
  [ 2.786035] raid6: .... xor() 15196 MB/s, rmw enabled 
  [ 2.791196] raid6: using avx2x2 recovery algorithm 
  ... 

  It would be desirable to reduce or eliminate this delay.

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