From: David Marchand <david.marchand@redhat.com>
To: Takeshi Yoshimura <tyos@jp.ibm.com>
Cc: dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] eal: forcing IOVA as PA in ppc
Date: Wed, 31 Jul 2019 11:29:11 +0200 [thread overview]
Message-ID: <CAJFAV8wBG5i0rg2hVjXwF=qwMGfqj5VqUZ95MQmas1Yi_njj1Q@mail.gmail.com> (raw)
In-Reply-To: <20190731033523.2482-1-tyos@jp.ibm.com>
On Wed, Jul 31, 2019 at 5:36 AM Takeshi Yoshimura <tyos@jp.ibm.com> wrote:
>
> Commit b76fafb174d2 ("eal: fix IOVA mode selection as VA for PCI
> drivers") breaks ppc apps with no IOVA configs (or RTE_IOVA_DC)
> because of the inconsistency of user's request and the result of
> device capability for IOVA mode. I updated the code to force IOVA as
> PA in ppc as before because current ppc driver does not support VA
> mode.
What is the "ppc driver" you are referring to?
Do you mean the vfio implementation for ppc?
>
> Theoretically, ppc can support VA mode, but I suspect that ppc with
> VA mode may have performance issues to create a big DMA window
> (VA often uses higher addresses than PA). So, I didn't change the
> code to check device capability in ppc.
Sorry, I am confused.
Is VA mode not working at all? or is it a performance issue?
--
David Marchand
next prev parent reply other threads:[~2019-07-31 9:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-31 3:35 Takeshi Yoshimura
2019-07-31 9:10 ` Burakov, Anatoly
2019-07-31 9:29 ` David Marchand [this message]
2019-07-31 10:34 ` Takeshi T Yoshimura
2019-07-31 10:44 ` Takeshi T Yoshimura
2019-07-31 10:58 ` David Marchand
2019-07-31 19:23 ` David Christensen
2019-07-31 19:32 ` David Marchand
2019-07-31 21:20 ` David Christensen
2019-08-01 5:04 ` David Marchand
2019-07-31 19:44 ` David Marchand
2019-08-01 4:10 ` Takeshi T Yoshimura
2019-08-01 5:01 ` David Marchand
2019-08-01 5:25 ` Takeshi T Yoshimura
2019-08-01 7:15 ` David Marchand
2019-08-01 8:46 ` Takeshi T Yoshimura
2019-08-01 9:46 ` David Marchand
2019-08-02 8:09 ` Takeshi T Yoshimura
2019-08-02 8:22 ` David Marchand
2019-08-01 4:12 ` Takeshi T Yoshimura
2019-08-01 13:01 ` David Marchand
2019-08-02 8:50 ` Burakov, Anatoly
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