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
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