> > In Summary, > CPU completing IO which is not contributing to IO submission, may cause cpu > lockup. > If CPUs count to MSI-X vector count ratio is X:1 (where X > 1) then using irq poll > interface, we can avoid the CPU lockups and by equally distributing the > interrupts among the enabled MSI-x interrupts we can avoid performance > issues. > > We are planning to use both the fixes only if cpu count is more than FW > supported MSI-x vector. > Please review and provide your feedback. I have appended both the patches. Hi - Assuming method explained here is in-line with Linux SCSI subsystem and there is no better method to fix such issue. I am planning to provide the same solution for internal testing and maintainers of respective driver (mpt3sas and megaraid_sas) will post final patch to the upstream based on results. As of now PoC results looks promising with the above mentioned solution and no cpu lock was discovered. > > Thanks, Kashyap > >
