Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node
From: "Russell King (Oracle)" <linux@armlinux.org.uk>
Date: 2021-07-09 10:16:26
Also in:
linux-iommu, linux-nvme, lkml
On Fri, Jul 09, 2021 at 04:38:09PM +0800, Ming Lei wrote:
I observed that NVMe performance is very bad when running fio on one CPU(aarch64) in remote numa node compared with the nvme pci numa node.
Have you checked the effect of running a memory-heavy process using memory from node 1 while being executed by CPUs in node 0? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel