On Wed, Dec 15, 2021 at 8:10 PM Max Gurtovoy <mgurtovoy@xxxxxxxxxx> wrote: > > > On 12/15/2021 3:15 AM, Yi Zhang wrote: > > On Tue, Dec 14, 2021 at 8:01 PM Max Gurtovoy <mgurtovoy@xxxxxxxxxx> wrote: > >> > >> On 12/14/2021 12:39 PM, Sagi Grimberg wrote: > >>>>>> Hi Sagi > >>>>>> It is still reproducible with the change, here is the log: > >>>>>> > >>>>>> # time nvme reset /dev/nvme0 > >>>>>> > >>>>>> real 0m12.973s > >>>>>> user 0m0.000s > >>>>>> sys 0m0.006s > >>>>>> # time nvme reset /dev/nvme0 > >>>>>> > >>>>>> real 1m15.606s > >>>>>> user 0m0.000s > >>>>>> sys 0m0.007s > >>>>> Does it speed up if you use less queues? (i.e. connect with -i 4) ? > >>>> Yes, with -i 4, it has stablee 1.3s > >>>> # time nvme reset /dev/nvme0 > >>> So it appears that destroying a qp takes a long time on > >>> IB for some reason... > >>> > >>>> real 0m1.225s > >>>> user 0m0.000s > >>>> sys 0m0.007s > >>>> > >>>>>> # dmesg | grep nvme > >>>>>> [ 900.634877] nvme nvme0: resetting controller > >>>>>> [ 909.026958] nvme nvme0: creating 40 I/O queues. > >>>>>> [ 913.604297] nvme nvme0: mapped 40/0/0 default/read/poll queues. > >>>>>> [ 917.600993] nvme nvme0: resetting controller > >>>>>> [ 988.562230] nvme nvme0: I/O 2 QID 0 timeout > >>>>>> [ 988.567607] nvme nvme0: Property Set error: 881, offset 0x14 > >>>>>> [ 988.608181] nvme nvme0: creating 40 I/O queues. > >>>>>> [ 993.203495] nvme nvme0: mapped 40/0/0 default/read/poll queues. > >>>>>> > >>>>>> BTW, this issue cannot be reproduced on my NVME/ROCE environment. > >>>>> Then I think that we need the rdma folks to help here... > >>> Max? > >> It took me 12s to reset a controller with 63 IO queues with 5.16-rc3+. > >> > >> Can you try repro with latest versions please ? > >> > >> Or give the exact scenario ? > > Yeah, both target and client are using Mellanox Technologies MT27700 > > Family [ConnectX-4], could you try stress "nvme reset /dev/nvme0", the > > first time reset will take 12s, and it always can be reproduced at the > > second reset operation. > > I created a target with 1 namespace backed by null_blk and connected to > it from the same server in loopback rdma connection using the ConnectX-4 > adapter. Could you share your loop.json file so I can try it on my environment? And can you try it with two servers that both have CX-4? This should be easier to reproduce it. > > I run a loop with the "nvme reset" command and it took me 4-5 secs to > reset each time.. > > > > > >> > > > -- Best Regards, Yi Zhang
