• Chuck Lever's avatar
    svcrdma: Persistently allocate and DMA-map Send buffers · 99722fe4
    Chuck Lever authored
    While sending each RPC Reply, svc_rdma_sendto allocates and DMA-
    maps a separate buffer where the RPC/RDMA transport header is
    constructed. The buffer is unmapped and released in the Send
    completion handler. This is significant per-RPC overhead,
    especially for small RPCs.
    
    Instead, allocate and DMA-map a buffer, and cache it in each
    svc_rdma_send_ctxt. This buffer and its mapping can be re-used
    for each RPC, saving the cost of memory allocation and DMA
    mapping.
    Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
    Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
    99722fe4
svc_rdma_recvfrom.c 20.7 KB