• C
    SUNRPC: RPC buffer size estimates are too large · 2bea90d4
    Chuck Lever 提交于
    The RPC buffer size estimation logic in net/sunrpc/clnt.c always
    significantly overestimates the requirements for the buffer size.
    A little instrumentation demonstrated that in fact rpc_malloc was never
    allocating the buffer from the mempool, but almost always called kmalloc.
    
    To compute the size of the RPC buffer more precisely, split p_bufsiz into
    two fields; one for the argument size, and one for the result size.
    
    Then, compute the sum of the exact call and reply header sizes, and split
    the RPC buffer precisely between the two.  That should keep almost all RPC
    buffers within the 2KiB buffer mempool limit.
    
    And, we can finally be rid of RPC_SLACK_SPACE!
    Signed-off-by: NChuck Lever <chuck.lever@oracle.com>
    Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
    2bea90d4
xprt.c 25.7 KB