linux-kernel - Re: [PATCH] PCI: Clear bridge MEM_64 flag if one child does not support it

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Message-ID: <CAE9FiQXofeVMkGq7r5SqnveSfOcYjmuuSdZB-LAiSXjof2X0Jw@mail.gmail.com>
Date:	Tue, 9 Dec 2014 15:16:25 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Marek Kordík <kordikmarek@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	Alexey Voronkov <zermond@...il.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Clear bridge MEM_64 flag if one child does not
 support it

On Tue, Dec 9, 2014 at 2:15 PM, Marek Kordík <kordikmarek@...il.com> wrote:
> On 12/09/2014 08:42 PM, Yinghai Lu wrote:
>>
>> On Tue, Dec 9, 2014 at 10:22 AM, Bjorn Helgaas <bhelgaas@...gle.com>
>> wrote:
>>>
>>> On Tue, Dec 9, 2014 at 11:07 AM, Marek Kordík <kordikmarek@...il.com>
>>> wrote:
>>>>
>>>> I have built and booted your branch and it works well. Do you want me to
>>>> attach some logs?
>>>> (I am new here and I have read http://www.tux.org/lkml/ and I don't want
>>
>> Can you run some graphics benchmark program to check the performance
>> between
>> 1.
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
>>   branch: for-pci-allocate-fit-3.18
>>
>> 2.
>> v 3.18 + clear mmio64 flags when children device does not support it
>>
>>
> I have run Unigine Heaven benchmark on both versions (I tried version 2.
> with and also without kernel parameters "debug ignore_loglevel pci=realloc")
> and the performance of each version was the same (70-71 points). I tried to
> run this benchmark also with kernel 3.15.10 and the result was 67 points.
> Tomorrow I can try to run some more benchmarks, today I didn't have much
> time.

so putting  mem pref under bridge mem does not cause performance loss?

Thanks

Yinghai
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