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SubjectRe: [PATCH] RDMA/core: reduce IB_POLL_BATCH constant
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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.



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