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From: Matt Laswell <laswell@infiniteio.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Subject: [dpdk-dev] A question about hugepage initialization time
Date: Tue, 9 Dec 2014 10:33:59 -0600
Message-ID: <CA+GnqArTJoVd9Hh2xZ-fFhHRnUdbgvxB5Tp+rvi2crUi0-9g9A@mail.gmail.com> (raw)

Hey Folks,

Our DPDK application deals with very large in memory data structures, and
can potentially use tens or even hundreds of gigabytes of hugepage memory.
During the course of development, we've noticed that as the number of huge
pages increases, the memory initialization time during EAL init gets to be
quite long, lasting several minutes at present.  The growth in init time
doesn't appear to be linear, which is concerning.

This is a minor inconvenience for us and our customers, as memory
initialization makes our boot times a lot longer than it would otherwise
be.  Also, my experience has been that really long operations often are
hiding errors - what you think is merely a slow operation is actually a
timeout of some sort, often due to misconfiguration. This leads to two
questions:

1. Does the long initialization time suggest that there's an error
happening under the covers?
2. If not, is there any simple way that we can shorten memory
initialization time?

Thanks in advance for your insights.

--
Matt Laswell
laswell@infiniteio.com
infinite io, inc.

             reply	other threads:[~2014-12-09 16:34 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-09 16:33 Matt Laswell [this message]
2014-12-09 16:50 ` Burakov, Anatoly
2014-12-09 19:06 ` Matthew Hall
2014-12-09 22:05   ` Matt Laswell
2014-12-09 19:45 ` &rew
2014-12-09 22:10   ` Stephen Hemminger
2014-12-10 10:32     ` Bruce Richardson
2014-12-10 14:29       ` Neil Horman
2014-12-10 14:35         ` Bruce Richardson
2014-12-10 19:16           ` László Vadkerti
2014-12-11 10:14             ` Bruce Richardson
2014-12-12  4:07               ` László Vadkerti
2014-12-12  9:59                 ` Bruce Richardson
2014-12-12 15:50                   ` Thomas Monjalon

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