Date: Thu, 27 Dec 2012 09:15:22 +0000 (UTC) From: Luigi Rizzo <luigi@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r244731 - head/tools/tools/netrate/netsend Message-ID: <201212270915.qBR9FMDa048640@svn.freebsd.org>
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Author: luigi Date: Thu Dec 27 09:15:21 2012 New Revision: 244731 URL: http://svnweb.freebsd.org/changeset/base/244731 Log: use nanosecond resolution, make sure gettimeofday is called at most every 100 packets. Modified: head/tools/tools/netrate/netsend/netsend.c Modified: head/tools/tools/netrate/netsend/netsend.c ============================================================================== --- head/tools/tools/netrate/netsend/netsend.c Thu Dec 27 08:10:58 2012 (r244730) +++ head/tools/tools/netrate/netsend/netsend.c Thu Dec 27 09:15:21 2012 (r244731) @@ -144,7 +144,7 @@ timing_loop(struct _a *a) long finishtime; long send_errors, send_calls; /* do not call gettimeofday more than every 20us */ - long minres_ns = 20000; + long minres_ns = 200000; int ic, gettimeofday_cycles; int cur_port; uint64_t n, ns; @@ -154,17 +154,22 @@ timing_loop(struct _a *a) return (-1); } + ns = a->interval.tv_nsec; if (timespec_ge(&tmptime, &a->interval)) fprintf(stderr, "warning: interval (%jd.%09ld) less than resolution (%jd.%09ld)\n", (intmax_t)a->interval.tv_sec, a->interval.tv_nsec, (intmax_t)tmptime.tv_sec, tmptime.tv_nsec); - if (a->interval.tv_nsec < minres_ns) { - gettimeofday_cycles = minres_ns/(tmptime.tv_nsec + 1); - fprintf(stderr, - "calling time every %d cycles\n", gettimeofday_cycles); - } else - gettimeofday_cycles = 0; + /* interval too short, limit the number of gettimeofday() + * calls, but also make sure there is at least one every + * some 100 packets. + */ + if ((long)ns < minres_ns/100) + gettimeofday_cycles = 100; + else + gettimeofday_cycles = minres_ns/ns; + fprintf(stderr, + "calling time every %d cycles\n", gettimeofday_cycles); if (clock_gettime(CLOCK_REALTIME, &starttime) == -1) { perror("clock_gettime");
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