usr/src/sys/nfs/nfsrtt.h

/*
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)nfsrtt.h    7.2 (Berkeley) %G%
 */

/*
 * Definitions for performance monitor.
 * The client and server logging are turned on by setting the global
 * constant "nfsrtton" to 1.
 */
#define NFSRTTLOGSIZ    128

/*
 * Circular log of client side rpc activity. Each log entry is for one
 * rpc filled in upon completion. (ie. in order of completion)
 * The "pos" is the table index for the "next" entry, therefore the
 * list goes from nfsrtt.rttl[pos] --> nfsrtt.rttl[pos - 1] in
 * chronological order of completion.
 */
struct nfsrtt {
        int pos;                        /* Position in array for next entry */
        struct rttl {
                int     proc;           /* NFS procedure number */
                int     rtt;            /* Measured round trip time */
                int     rto;            /* Round Trip Timeout */
                int     sent;           /* # rpcs in progress */
                int     cwnd;           /* Send window */
                int     srtt;           /* Ave Round Trip Time */
                int     sdrtt;          /* Ave mean deviation of RTT */
                fsid_t  fsid;           /* Fsid for mount point */
                struct timeval tstamp;  /* Timestamp of log entry */
        } rttl[NFSRTTLOGSIZ];
};

/*
 * And definitions for server side performance monitor.
 * The log organization is the same as above except it is filled in at the
 * time the server sends the rpc reply.
 */

/*
 * Bits for the flags field.
 */
#define DRT_NQNFS       0x01    /* Rpc used Nqnfs protocol */
#define DRT_TCP         0x02    /* Client used TCP transport */
#define DRT_CACHEREPLY  0x04    /* Reply was from recent request cache */
#define DRT_CACHEDROP   0x08    /* Rpc request dropped, due to recent reply */

/*
 * Server log structure
 * NB: ipadr == INADDR_ANY indicates a client using a non IP protocol.
 *      (ISO perhaps?)
 */
struct nfsdrt {
        int pos;                        /* Position of next log entry */
        struct drt {
                int     flag;           /* Bits as defined above */
                int     proc;           /* NFS procedure number */
                u_long  ipadr;          /* IP address of client */
                int     resptime;       /* Response time (usec) */
                struct timeval tstamp;  /* Timestamp of log entry */
        } drt[NFSRTTLOGSIZ];
};