Comment # 22 on bug 911347 from Thomas Blume

(In reply to Bruno Pesavento from comment #21)
> Created attachment 621355 [details]
> Flushing times with /var/log mounted with autodefrag option
> 
> Mounting /var/log autodefrag is definitely a better workaround: flushing
> time is still less than 4 s with a 41.9 MB system journal.
> Now removed the 34MB limit, to be able to test upcoming patches with larger
> files.

Ok, thanks for the feedback.
We might still set an upper limit for the journal files, because the manpage
states:

-->--
autodefrag

Disable/enable auto defragmentation. Auto defragmentation detects small random
writes into files and queue them up for the defrag process. Works best for
small files; Not well suited for large database workloads.
--<--

But this rather refers to files of gigabyte size.
Can you test with SystemMaxFileSize up to 1Gb and check wheter you see any
negative impact?