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From: "Takeshi T Yoshimura" <TYOS@jp.ibm.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] eal: forcing IOVA as PA in ppc
Date: Wed, 31 Jul 2019 10:34:40 +0000	[thread overview]
Message-ID: <OFBEFB7107.78BD611F-ON00258448.0039DB76-00258448.003A1B52@notes.na.collabserv.com> (raw)
In-Reply-To: <CAJFAV8wBG5i0rg2hVjXwF=qwMGfqj5VqUZ95MQmas1Yi_njj1Q@mail.gmail.com>

-----David Marchand <david.marchand@redhat.com> wrote: -----

>To: Takeshi Yoshimura <tyos@jp.ibm.com>
>From: David Marchand <david.marchand@redhat.com>
>Date: 07/31/2019 06:29PM
>Cc: dev <dev@dpdk.org>
>Subject: [EXTERNAL] Re: [dpdk-dev] [PATCH] eal: forcing IOVA as PA in
>ppc
>
>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
>
>

Current code does not implement VA mode for ppc. So, yes. VA mode
is not working under current dpdk on ppc.


  parent reply	other threads:[~2019-07-31 10:34 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
2019-07-31 10:34 ` Takeshi T Yoshimura [this message]
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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