From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan.Glauber@cavium.com (Jan Glauber) Date: Fri, 12 Oct 2018 11:03:34 +0000 Subject: DMA remote memcpy requests In-Reply-To: References: <20181012090937.GA12289@arm.com> Message-ID: <20181012110326.GA6721@hc> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Oct 12, 2018 at 09:48:01AM +0000, Adam Cottrel wrote: > Hi Will, > > Thank you for getting back to me. > > > [+Robin and Cavium folks -- it's usually best to cc people as well as mailing > > the list] > I will remember this for future. Thanks for the advice. > > > > I am using the ATH10K on Linux 14.4 with an Arm Cavium processor. > > > During heavy loading, I am seeing that target initiated DMA requests > > > are being silently dropped under extreme IO memory pressure and it is > > > proving very difficult to isolate the root cause. > > > > Is this ThunderX 1 or 2 or something else? Can you reproduce the issue with > > mainline? > I am using:- > model = "Cavium ThunderX CN81XX board"; > compatible = "cavium,thunder-81xx"; > Hi Adam, what is the exact hardware revision (shown in /proc/cpuinfo) ? --Jan