From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikolay Borisov Subject: Re: intel iommu causing performance drop in mlx4 ipoib (OFFLIST) Date: Mon, 16 May 2016 15:46:04 +0300 Message-ID: <5739C10C.6040805@kyup.com> References: <5739A347.20807@kyup.com> <1463396094.2484.194.camel@infradead.org> <5739BEEC.3070308@kyup.com> <1463402381.2484.202.camel@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1463402381.2484.202.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: David Woodhouse Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-rdma@vger.kernel.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? -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html