On Wed, Aug 9, 2017 at 7:12 AM, Leizhen (ThunderTown) <thunder.leiz...@huawei.com> wrote: > > > On 2017/8/8 20:03, Ganapatrao Kulkarni wrote: >> 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? > Host
As per your log, iperf throughput is improved to 938 Mbits/sec from 6.43 Mbits/sec. IMO, this seems to be unrealistic, some thing wrong with the testing? > >> >>>> >>>> >>>> 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 >> >> . >> > > -- > Thanks! > BestRegards > thanks Ganapat _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
