From: Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org>
To: David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: intel iommu causing performance drop in mlx4 ipoib (OFFLIST)
Date: Mon, 16 May 2016 15:46:04 +0300 [thread overview]
Message-ID: <5739C10C.6040805@kyup.com> (raw)
In-Reply-To: <1463402381.2484.202.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
On 05/16/2016 03:39 PM, David Woodhouse wrote:
> On Mon, 2016-05-16 at 15:37 +0300, Nikolay Borisov wrote:
>>
>> Oops, turned out I had intel_iommu=on, though I'm sure some days ago I
>> didn't and performance suffered. I now tried with this option removed
>> and performance is again back to normal. All in all this driver +
>> intel_iommu is a bad combination I guess. Anyway, sorry for the noise
>> and thanks for the prompt reply.
>
> I would be very interested to see your results with the latest code
> from git://git.infradead.org/intel-iommu.git (and with the IOMMU still
> enabled).
Would I be able to apply this cleanly on 4.4, since this is the version
I'm currently using?
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next prev parent reply other threads:[~2016-05-16 12:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-16 10:39 intel iommu causing performance drop in mlx4 ipoib Nikolay Borisov
[not found] ` <5739A347.20807-6AxghH7DbtA@public.gmane.org>
2016-05-16 10:54 ` David Woodhouse
[not found] ` <1463396094.2484.194.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-05-16 12:37 ` Nikolay Borisov
[not found] ` <5739BEEC.3070308-6AxghH7DbtA@public.gmane.org>
2016-05-16 12:39 ` David Woodhouse
[not found] ` <1463402381.2484.202.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-05-16 12:46 ` Nikolay Borisov [this message]
[not found] ` <5739C10C.6040805-6AxghH7DbtA@public.gmane.org>
2016-05-16 12:53 ` intel iommu causing performance drop in mlx4 ipoib (OFFLIST) David Woodhouse
2016-05-16 12:05 ` intel iommu causing performance drop in mlx4 ipoib Or Gerlitz
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