On Wed, Jul 26, 2017 at 4:47 PM, Leizhen (ThunderTown) <thunder.leiz...@huawei.com> wrote: > > > On 2017/7/26 19:08, Joerg Roedel wrote: >> Hi Robin. >> >> On Fri, Jul 21, 2017 at 12:41:57PM +0100, Robin Murphy wrote: >>> Hi all, >>> >>> In the wake of the ARM SMMU optimisation efforts, it seems that certain >>> workloads (e.g. storage I/O with large scatterlists) probably remain quite >>> heavily influenced by IOVA allocation performance. Separately, Ard also >>> reported massive performance drops for a graphical desktop on AMD Seattle >>> when enabling SMMUs via IORT, which we traced to dma_32bit_pfn in the DMA >>> ops domain getting initialised differently for ACPI vs. DT, and exposing >>> the overhead of the rbtree slow path. Whilst we could go around trying to >>> close up all the little gaps that lead to hitting the slowest case, it >>> seems a much better idea to simply make said slowest case a lot less slow. >> >> Do you have some numbers here? How big was the impact before these >> patches and how is it with the patches? > Here are some numbers: > > (before)$ iperf -s > ------------------------------------------------------------ > Server listening on TCP port 5001 > TCP window size: 85.3 KByte (default) > ------------------------------------------------------------ > [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35898 > [ ID] Interval Transfer Bandwidth > [ 4] 0.0-10.2 sec 7.88 MBytes 6.48 Mbits/sec > [ 5] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35900 > [ 5] 0.0-10.3 sec 7.88 MBytes 6.43 Mbits/sec > [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35902 > [ 4] 0.0-10.3 sec 7.88 MBytes 6.43 Mbits/sec > > (after)$ iperf -s > ------------------------------------------------------------ > Server listening on TCP port 5001 > TCP window size: 85.3 KByte (default) > ------------------------------------------------------------ > [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36330 > [ ID] Interval Transfer Bandwidth > [ 4] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec > [ 5] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36332 > [ 5] 0.0-10.0 sec 1.10 GBytes 939 Mbits/sec > [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36334 > [ 4] 0.0-10.0 sec 1.10 GBytes 938 Mbits/sec >
Is this testing done on Host or on Guest/VM? >> >> >> Joerg >> >> >> . >> > > -- > Thanks! > BestRegards > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-ker...@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel thanks Ganapat _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
