From: David Marchand <david.marchand@redhat.com>
To: Anatoly Burakov <anatoly.burakov@intel.com>
Cc: dev <dev@dpdk.org>, John McNamara <john.mcnamara@intel.com>,
Marko Kovacevic <marko.kovacevic@intel.com>,
iain.barker@oracle.com, edwin.leung@oracle.com,
Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [PATCH] eal: add option to not store segment fd's
Date: Fri, 29 Mar 2019 10:50:58 +0100 [thread overview]
Message-ID: <CAJFAV8x540Zv8r3iMm+-xbPpTrAaOjh+j4P_8vaXtRBUJW0sPw@mail.gmail.com> (raw)
Message-ID: <20190329095058.OTREuxtyQW5REWy3c2Ij407f5K0mER4z-pLLgMqn4fA@z> (raw)
In-Reply-To: <07f664c33ddedaa5dcfe82ecb97d931e68b7e33a.1550855529.git.anatoly.burakov@intel.com>
On Fri, Feb 22, 2019 at 6:12 PM Anatoly Burakov <anatoly.burakov@intel.com>
wrote:
> Due to internal glibc limitations [1], DPDK may exhaust internal
> file descriptor limits when using smaller page sizes, which results
> in inability to use system calls such as select() by user
> applications.
>
> While the problem can be worked around using --single-file-segments
> option, it does not work if --legacy-mem mode is also used. Add a
> (yet another) EAL flag to disable storing fd's internally. This
> will sacrifice compability with Virtio with vhost-backend, but
> at least select() and friends will work.
>
> [1] https://mails.dpdk.org/archives/dev/2019-February/124386.html
Sorry, I am a bit lost and I never took the time to look in the new memory
allocation system.
This gives the impression that we are accumulating workarounds, between
legacy-mem, single-file-segments, now no-seg-fds.
Iiuc, everything revolves around the need for per page locks.
Can you summarize why we need them?
Thanks.
--
David Marchand
next prev parent reply other threads:[~2019-03-29 9:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 17:12 Anatoly Burakov
2019-03-29 9:50 ` David Marchand [this message]
2019-03-29 9:50 ` David Marchand
2019-03-29 10:33 ` Burakov, Anatoly
2019-03-29 10:33 ` Burakov, Anatoly
2019-03-29 11:34 ` Thomas Monjalon
2019-03-29 11:34 ` Thomas Monjalon
2019-03-29 12:05 ` Burakov, Anatoly
2019-03-29 12:05 ` Burakov, Anatoly
2019-03-29 12:40 ` Thomas Monjalon
2019-03-29 12:40 ` Thomas Monjalon
2019-03-29 13:24 ` Burakov, Anatoly
2019-03-29 13:24 ` Burakov, Anatoly
2019-03-29 13:34 ` Thomas Monjalon
2019-03-29 13:34 ` Thomas Monjalon
2019-03-29 14:21 ` Burakov, Anatoly
2019-03-29 14:21 ` Burakov, Anatoly
2019-03-29 13:35 ` Maxime Coquelin
2019-03-29 13:35 ` Maxime Coquelin
2019-03-29 17:55 ` [dpdk-dev] [PATCH v2 1/2] memalloc: refactor segment resizing code Anatoly Burakov
2019-03-29 17:55 ` Anatoly Burakov
2019-03-29 17:55 ` [dpdk-dev] [PATCH v2 2/2] memalloc: do not use lockfiles for single file segments mode Anatoly Burakov
2019-03-29 17:55 ` Anatoly Burakov
2019-04-02 14:08 ` Thomas Monjalon
2019-04-02 14:08 ` Thomas Monjalon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAJFAV8x540Zv8r3iMm+-xbPpTrAaOjh+j4P_8vaXtRBUJW0sPw@mail.gmail.com \
--to=david.marchand@redhat.com \
--cc=anatoly.burakov@intel.com \
--cc=dev@dpdk.org \
--cc=edwin.leung@oracle.com \
--cc=iain.barker@oracle.com \
--cc=john.mcnamara@intel.com \
--cc=marko.kovacevic@intel.com \
--cc=thomas@monjalon.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).