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Re: Disk writes much slower in Bookworm i386 [Was: svnadmin dump ...]

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> I have done additional research, and it now appears that programs that do
> extensive disk writes run much slower (3-6x) in Bookworm than they did in
> Bullseye.  The two cases I have observed are 'svnadmin dump', and extracting
> an SQL backup of a Bacula database from Postgresql (backup file about 3 GB).
> Operations that perform extensive reads (a Bacula backup operation to
> magnetic tape, 600 GB) seem to run at the same speed as before.
>
> At the moment, this is a 32-bit PAE system.  I don't know of an obvious
> reason why that would matter.  At the time of the upgrade, the system memory
> was enlarged from 16 to 32GB, in anticipation of converting the system from
> i386 to amd64.

FWIW, I've had very serious write performance issues on my Thinkpad T61
(8GB RAM + SSD) when using a 32bit PAE kernel (occasionally below 1MB/s,
tho not reliably reproducible, e.g. not right after boot).

Those problems disappeared when I switched to an amd64 kernel (while
keeping the userland 32bit).

https://serverfault.com/questions/996495/writes-throttled-to-500kb-s

Your symptoms seem quite different, but with 16GB of RAN, I'd strongly
suggest you try an amd64 kernel, just in case.


        Stefan

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Disk writes much slower in Bookworm i386 [Was: svnadmin dump ...] <kjohnson@eclypse.org> - 2023-08-15 00:20 +0200
  Re: Disk writes much slower in Bookworm i386 [Was: svnadmin dump ...] Stefan Monnier <monnier@iro.umontreal.ca> - 2023-08-15 04:10 +0200
  Re: Disk writes much slower in Bookworm i386 [Was: svnadmin dump ...] Max Nikulin <manikulin@gmail.com> - 2023-08-15 04:40 +0200

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