Public bug reported:
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.
** Affects: linux-gcp (Ubuntu)
Importance: Undecided
Assignee: Marcelo Cerri (mhcerri)
Status: In Progress
** Affects: linux-gcp (Ubuntu Xenial)
Importance: Undecided
Status: New
** Affects: linux-gcp (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-gcp (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-gcp (Ubuntu Xenial)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1812728
Title:
linux-gcp: Reduce boot latency due to RAID6_PQ
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-gcp/+bug/1812728/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
