From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, andras.kovacs@ericsson.com,
laszlo.vadkeri@ericsson.com, keith.wiles@intel.com,
benjamin.walker@intel.com, bruce.richardson@intel.com,
thomas@monjalon.net
Subject: Re: [dpdk-dev] [RFC v2 00/23] Dynamic memory allocation for DPDK
Date: Tue, 19 Dec 2017 16:02:51 +0000 [thread overview]
Message-ID: <6d025303-f974-077f-511a-51cd62203925@intel.com> (raw)
In-Reply-To: <20171219074635.6c4f656d@xeon-e3>
On 19-Dec-17 3:46 PM, Stephen Hemminger wrote:
> On Tue, 19 Dec 2017 11:14:27 +0000
> Anatoly Burakov <anatoly.burakov@intel.com> wrote:
>
>> This patchset introduces a prototype implementation of dynamic memory allocation
>> for DPDK. It is intended to start a conversation and build consensus on the best
>> way to implement this functionality. The patchset works well enough to pass all
>> unit tests, and to work with traffic forwarding, provided the device drivers are
>> adjusted to ensure contiguous memory allocation where it matters.
>
>
> What exact functionality is this patchset trying to enable.
> It isn't clear what is broken now. Is it a cleanup or something that
> is being motivated by memory layout issues?
>
Hi Stephen,
Apologies for not making that clear enough in the cover letter.
The big issue this patchset is trying to solve is the static-ness of
DPDK's memory allocation. I.e. you reserve memory on startup, and that's
it - you can't allocate any more memory from the system, and you can't
free it back without stopping the application.
With this patchset, you can do exactly that. You can basically start
with zero memory preallocated, and allocate (and free) as you go. For
example, if you apply this patchset and run malloc autotest, after
startup you will have used perhaps a single 2MB page. While the test is
running, you are going to allocate something to the tune of 14MB per
socket, and at the end you're back at eating 2MB of hugepage memory,
while all of the memory you used for autotest will be freed back to the
system. That's the main use case this patchset is trying to address.
Down the line, there are other issues to be solved, which are outlined
in the cover letter (the aforementioned "discussion points"), but for
this iteration, dynamic allocation/free of DPDK memory is the one issue
that is being addressed.
--
Thanks,
Anatoly
next prev parent reply other threads:[~2017-12-19 16:02 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-19 11:14 Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 01/23] eal: move get_virtual_area out of linuxapp eal_memory.c Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 02/23] eal: add function to report number of detected sockets Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 03/23] eal: add rte_fbarray Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 04/23] eal: move all locking to heap Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 05/23] eal: protect malloc heap stats with a lock Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 06/23] eal: make malloc a doubly-linked list Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 07/23] eal: make malloc_elem_join_adjacent_free public Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 08/23] eal: add "single file segments" command-line option Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 09/23] eal: add "legacy memory" option Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 10/23] eal: read hugepage counts from node-specific sysfs path Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 11/23] eal: replace memseg with memseg lists Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 12/23] eal: add support for dynamic memory allocation Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 13/23] eal: make use of dynamic memory allocation for init Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 14/23] eal: add support for dynamic unmapping of pages Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 15/23] eal: add API to check if memory is physically contiguous Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 16/23] eal: enable dynamic memory allocation/free on malloc/free Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 17/23] eal: add backend support for contiguous memory allocation Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 18/23] eal: add rte_malloc support for allocating contiguous memory Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 19/23] eal: enable reserving physically contiguous memzones Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 20/23] eal: make memzones use rte_fbarray Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 21/23] mempool: add support for the new memory allocation methods Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 22/23] vfio: allow to map other memory regions Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 23/23] eal: map/unmap memory with VFIO when alloc/free pages Anatoly Burakov
2017-12-19 15:46 ` [dpdk-dev] [RFC v2 00/23] Dynamic memory allocation for DPDK Stephen Hemminger
2017-12-19 16:02 ` Burakov, Anatoly [this message]
2017-12-19 16:06 ` Stephen Hemminger
2017-12-19 16:09 ` Burakov, Anatoly
2017-12-21 21:38 ` Walker, Benjamin
2017-12-22 9:13 ` Burakov, Anatoly
2017-12-26 17:19 ` Walker, Benjamin
2018-02-02 19:28 ` Yongseok Koh
2018-02-05 10:03 ` Burakov, Anatoly
2018-02-05 10:18 ` Nélio Laranjeiro
2018-02-05 10:36 ` Burakov, Anatoly
2018-02-06 9:10 ` Nélio Laranjeiro
2018-02-14 2:01 ` Yongseok Koh
2018-02-14 9:32 ` Burakov, Anatoly
2018-02-14 18:13 ` Yongseok Koh
2018-01-13 14:13 ` Burakov, Anatoly
2018-01-23 22:33 ` Yongseok Koh
2018-01-25 16:18 ` Burakov, Anatoly
2018-02-14 8:04 ` Thomas Monjalon
2018-02-14 10:07 ` Burakov, Anatoly
2018-04-25 16:02 ` Burakov, Anatoly
2018-04-25 16:12 ` Stephen Hemminger
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