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