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From: Thomas Monjalon <thomas@monjalon.net>
To: anatoly.burakov@intel.com
Cc: david.marchand@redhat.com, bruce.richardson@intel.com,
	dmitry.kozliuk@gmail.com, dev@dpdk.org
Subject: [dpdk-dev] logs about hugepages detection
Date: Wed, 15 Sep 2021 15:52:35 +0200	[thread overview]
Message-ID: <1768095.o955dqoAmz@thomas> (raw)

Hi,

I would like to discuss some issues in logging of hugepage lookup.
The issues to be discussed will be enumerated and numbered below.
I will take an example of an x86 machine with 2M and 1G pages.
I reserve only 2M pages:

	usertools/dpdk-hugepages.py -p 2M -r 80M

If I start a DPDK application with --log-level info
the only message I read makes me think something is wrong:

	EAL: No available 1048576 kB hugepages reported

1/ Log level is too high.

If I start with EAL in debug level, I can see which page size is used:

	--log-level debug --log-level lib.eal:debug

	EAL: No available 1048576 kB hugepages reported
	[...]
	EAL: Detected memory type: socket_id:0 hugepage_sz:2097152

2/ The positive message should be at the same level as the negative one.

3/ The sizes are sometimes written in bytes, sometimes in kB.
It should be always the highest unit, including GB.

When using the --in-memory mode, things are worst:

	EAL: No available 1048576 kB hugepages reported
	EAL: In-memory mode enabled, hugepages of size 1073741824 bytes will be allocated anonymously
	EAL: No free 1048576 kB hugepages reported on node 0
	EAL: No available 1048576 kB hugepages reported
	[...]
	EAL: Detected memory type: socket_id:0 hugepage_sz:1073741824
	EAL: Detected memory type: socket_id:0 hugepage_sz:2097152

4/ The unavailability of 1G should be reported only once.

5/ If non-reserved pages can be used without reservation, it should be better documented.

Please correct me if I'm wrong, and give your opinion.
I could work on some patches if needed.



             reply	other threads:[~2021-09-15 13:52 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-15 13:52 Thomas Monjalon [this message]
2021-09-15 14:25 ` [dpdk-dev] logs about hugepages detection Bruce Richardson
2021-09-15 14:39   ` Thomas Monjalon
2021-09-15 14:59     ` Bruce Richardson
2021-09-15 16:34       ` Stephen Hemminger

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