From: Kaike Wan <kaike.wan@xxxxxxxxx> A SA cache is undeniably critical for fabric scalability and performance. In user space, the ibacm application provides a good example of pathrecord cache for address and route resolution. With the recent implementation of the provider architecture, ibacm offers more extensibility as a SA cache. In kernel, ipoib implements its own small cache for pathrecords, which is however not available for general use. Furthermore, the implementation of a SA cache in user space offers better flexibility, larger capacity, and more robustness for the system. In this patch series, a mechanism is implemented to allow ib_sa to send pathrecord query to a user application (eg ibacm) through netlink. Potentially, this mechanism could be easily extended to other SA queries. With a customized test implemented in rdma_cm module (not included in this series), it was shown that the time to retrieve 1 million pathrecords dropped from 46660 jiffies (46.66 seconds) to 16119 jiffies (or 16.119 seconds) on a two-node system, a reduction of more than 60%. Kaike Wan (3): IB/netlink: Add defines for MAD requests through netlink IB/core: Check the presence of netlink multicast group listeners IB/sa: route SA pathrecord query through netlink drivers/infiniband/core/netlink.c | 8 + drivers/infiniband/core/sa_query.c | 334 +++++++++++++++++++++++++++++++++++- include/rdma/rdma_netlink.h | 7 + include/uapi/rdma/rdma_netlink.h | 7 + 4 files changed, 351 insertions(+), 5 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
