On Tue, 2018-02-20 at 21:59 +0100, Arnd Bergmann wrote: > /* # of WCs to poll for with a single call to ib_poll_cq */ > -#define IB_POLL_BATCH 16 > +#define IB_POLL_BATCH 8
The purpose of batch polling is to minimize contention on the cq spinlock. Reducing the IB_POLL_BATCH constant may affect performance negatively. Has the performance impact of this change been verified for all affected drivers (ib_srp, ib_srpt, ib_iser, ib_isert, NVMeOF, NVMeOF target, SMB Direct, NFS over RDMA, ...)? Bart.
