Heho,
Just as an update now that everything ran; I adjusted the disk-runs to rsync a
full root to the disk to make things a bit more realistic; Ultimately, the
results show that, indeed, softdep ends up being ~as fast as mfs (apart from
reduced disk activity for mfs, of course), with noatime having limited effect.
https://storage.fiebig.nl/s/H4ZHCwPN85yg4zN
Will add an update accordingly. :-)
With best regards,
Tobais
-Original Message-
From: owner-m...@openbsd.org On Behalf Of Tobias Fiebig
Sent: Monday, 1 August 2022 21:34
To: misc@openbsd.org
Subject: Re: rpki-client disk utilization / noting mfs in man?
Heho,
> BTW rpki-client is one of the (relatively few) cases where softdep is likely
> to give a significant improvement in performance.
I took this as motivation to do some benchmarks (defaults, noatime, softdep,
noatime+softdep, mfs, mfs+noatime) on a VM with eight cores and 8gb of memory
using a dedicated 10gb disk for /var/cache/rpki-client.
(Preliminary) results here (currently avg. over 7-8 runs, will be 11):
https://storage.fiebig.nl/s/84TpQCTrQpa3S9j
Bottomline:
- Things are a lot faster all of a sudden. This might be related to more cores
(8 vs. 2 before) or more memory (8 vs. 4 before), a background task having been
running on the disks during the last tests, or the negative impact of those
initial boxes having had all files in one partition. I will at least test the
last case after the current benchmark has completed.
- noatime does not seem to have a major effect, and seems to reduce performance
upon import.
- You are right; softdep is nearly as good as mfs.
With best regards,
Tobias
