On Aug 22, 2023 / 08:20, Bart Van Assche wrote: > On 8/22/23 03:18, Shinichiro Kawasaki wrote: > > CC+: Bart, > > > > On Aug 21, 2023 / 20:46, Bob Pearson wrote: > > [...] > > > Shinichiro, > > > > Hello Bob, thanks for the response. > > > > > > > > I have been aware for a long time that there is a problem with blktests/srp. I see hangs in > > > 002 and 011 fairly often. > > > > I repeated the test case srp/011, and observed it hangs. This hang at srp/011 > > also can be recreated in stable manner. I reverted the commit 9b4b7c1f9f54 > > then observed the srp/011 hang disappeared. So, I guess these two hangs have > > same root cause. > > > > > I have not been able to figure out the root cause but suspect that > > > there is a timing issue in the srp drivers which cannot handle the slowness of the software > > > RoCE implemtation. If you can give me any clues about what you are seeing I am happy to help > > > try to figure this out. > > > > Thanks for sharing your thoughts. I myself do not have srp driver knowledge, and > > not sure what clue I should provide. If you have any idea of the action I can > > take, please let me know. > > Hi Shinichiro and Bob, > > When I initially developed the SRP tests these were working reliably in > combination with the rdma_rxe driver. Since 2017 I frequently see issues when > running the SRP tests on top of the rdma_rxe driver, issues that I do not see > if I run the SRP tests on top of the soft-iWARP driver (siw). How about > changing the default for the SRP tests from rdma_rxe to siw and to let the > RDMA community resolve the rdma_rxe issues? If it takes time to resolve the issues, it sounds a good idea to make siw driver default, since it will make the hangs less painful for blktests users. Another idea to reduce the pain is to improve srp/002 and srp/011 to detect the hangs and report them as failures. Having said that, some discussion started on this thread for resolution (thanks!) I would wait for a while and see how long it will take for solution, and if the actions on blktests side are valuable or not.
