* Thin pool CoW latency
@ 2023-03-05 20:40 Demi Marie Obenour
0 siblings, 0 replies; only message in thread
From: Demi Marie Obenour @ 2023-03-05 20:40 UTC (permalink / raw)
To: Joe Thornber
Cc: development, device-mapper, Linux Kernel Mailing List,
Marek Marczykowski-Górecki,
Qubes OS Development Mailing List, dm-devel
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Like Eric, I am very concerned about CoW latency and throughput. I
am almost certain that allocating new blocks and snapshot copy-on-write
are _the_ hot paths in Qubes OS. In particular, I suspect that
workloads such as building an image in a throwaway VM or installing
packages onto a root volume that had just been shapshotted are dominated
by metadata operations, rather than by in-place updates. I suspect that
frequently-snapshotted volumes will observe similar behavior in general.
- --
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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2023-03-05 20:40 Thin pool CoW latency Demi Marie Obenour
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