• Andy Adamson's avatar
    SUNRPC: add sending,pending queue and max slot to xprt stats · 15a45206
    Andy Adamson authored
    With static RPC slots, the xprt backlog queue stats were useful in showing
    when the transport (TCP) was starved by lack of RPC slots. The new dynamic
    RPC slot code, commit d9ba131d, always
    provides an RPC slot and so only uses the xprt backlog queue when the
    tcp_max_slot_table_entries value has been hit or when an allocation error
    occurs. All requests are now placed on the xprt sending or pending queue which
    need to be monitored for debugging.
    
    The max_slot stat shows the maximum number of dynamic RPC slots reached which is
    useful when debugging performance issues.
    
    Add the new fields at the end of the mountstats xprt stanza so that mountstats
    outputs the previous correct values and ignores the new fields. Bump
    NFS_IOSTATS_VERS.
    Signed-off-by: 's avatarAndy Adamson <andros@netapp.com>
    Signed-off-by: 's avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    15a45206
nfs_iostat.h 4.15 KB