From: Christoph Hellwig <hch@infradead.org>
To: David Wang <davidwang@zhaoxin.com>
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
gregkh@linuxfoundation.org, x86@kernel.org,
linux-kernel@vger.kernel.org, brucechang@via-alliance.com,
cooperyan@zhaoxin.com, qiyuanwang@zhaoxin.com,
benjaminpan@viatech.com, lukelin@viacpu.com, timguo@zhaoxin.com
Subject: Re: [PATCH] x86/dma-mapping: override via_no_dac for new VIA PCI bridges
Date: Mon, 16 Apr 2018 05:33:30 -0700 [thread overview]
Message-ID: <20180416123330.GA6848@infradead.org> (raw)
In-Reply-To: <1523870816-6214-1-git-send-email-davidwang@zhaoxin.com>
On Mon, Apr 16, 2018 at 05:26:56PM +0800, David Wang wrote:
> PCI bridges integrated in new VIA chipset/SoC have no DAC issue.
> Enable DAC for the platforms with these chipset/SoC can improve DMA performance about
> 20% when DRAM size > 4GB.
>
So we get an exception to an exception? Is there any way to figure
out the PCI IDs actually affected?
next prev parent reply other threads:[~2018-04-16 12:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-16 9:26 [PATCH] x86/dma-mapping: override via_no_dac for new VIA PCI bridges David Wang
2018-04-16 12:33 ` Christoph Hellwig [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-04-17 8:44 David Wang
2018-04-17 8:54 ` Thomas Gleixner
2018-04-17 13:00 ` 'Christoph Hellwig'
2018-04-17 13:33 ` Thomas Gleixner
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=20180416123330.GA6848@infradead.org \
--to=hch@infradead.org \
--cc=benjaminpan@viatech.com \
--cc=brucechang@via-alliance.com \
--cc=cooperyan@zhaoxin.com \
--cc=davidwang@zhaoxin.com \
--cc=gregkh@linuxfoundation.org \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=lukelin@viacpu.com \
--cc=mingo@redhat.com \
--cc=qiyuanwang@zhaoxin.com \
--cc=tglx@linutronix.de \
--cc=timguo@zhaoxin.com \
--cc=x86@kernel.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.