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[Bug 1134353] adopting BFQ to control I/O
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Thu, 25 Jul 2019 16:59:07 +0000
  • Message-id: <bug-1134353-21960-uUSR36eVI6@http.bugzilla.suse.com/>
http://bugzilla.suse.com/show_bug.cgi?id=1134353
http://bugzilla.suse.com/show_bug.cgi?id=1134353#c27

--- Comment #27 from Andreas Herrmann <aherrmann@xxxxxxxx> ---
Test runs of Paolo's script don't show anomalies on the test system
where I had gathered the original results.
(Maybe test file sizes in this script are too small to cause
a difference.)

I've also rerun io-fio-randread-async-seqwrite-ext4 from mmtests
with 5.2.2 (1) to ensure that performance differences are still
visible and (2) to double-check that each test run was done under
similar test conditions (ie. ensuring reboot between each test)
and (3) to see whether mitigations=auto vs. mitigations=off
has significant influence.

Those tests confirm what's in attachment 809495 for
"(3) io-fio-randread-async-seqwrite-ext4-nosecure".

Mitigations enabled or disabled didn't make a difference
(wrt bfq vs. mq-deadline).

Probably I'll rerun the other fio-randread tests with 5.2.2
also.

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