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Keep a per-DNS-server moving average of query latency.

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This commit is contained in:
Simon Kelley
2022-09-15 23:22:02 +01:00
parent 84bd46ddd7
commit a2ee2426bf
4 changed files with 22 additions and 8 deletions
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13
src/cache.c
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@@ -1664,19 +1664,18 @@ int cache_make_stat(struct txt_record *t)
{
char *new, *lenp;
int port, newlen, bytes_avail, bytes_needed;
unsigned int queries = 0, failed_queries = 0, nxdomain_replies = 0;
unsigned int queries = 0, failed_queries = 0;
for (serv1 = serv; serv1; serv1 = serv1->next)
if (!(serv1->flags & SERV_MARK) && sockaddr_isequal(&serv->addr, &serv1->addr))
{
serv1->flags |= SERV_MARK;
queries += serv1->queries;
failed_queries += serv1->failed_queries;
nxdomain_replies += serv1->nxdomain_replies;
}
port = prettyprint_addr(&serv->addr, daemon->addrbuff);
lenp = p++; /* length */
bytes_avail = bufflen - (p - buff );
bytes_needed = snprintf(p, bytes_avail, "%s#%d %u %u %u", daemon->addrbuff, port, queries, failed_queries, nxdomain_replies);
bytes_needed = snprintf(p, bytes_avail, "%s#%d %u %u", daemon->addrbuff, port, queries, failed_queries);
if (bytes_needed >= bytes_avail)
{
/* expand buffer if necessary */
@@ -1747,6 +1746,8 @@ void dump_cache(time_t now)
{
int port;
unsigned int queries = 0, failed_queries = 0, nxdomain_replies = 0;
unsigned int sigma_latency = 0, count_latency = 0;
for (serv1 = serv; serv1; serv1 = serv1->next)
if (!(serv1->flags & SERV_MARK) && sockaddr_isequal(&serv->addr, &serv1->addr))
{
@@ -1754,10 +1755,12 @@ void dump_cache(time_t now)
queries += serv1->queries;
failed_queries += serv1->failed_queries;
nxdomain_replies += serv1->nxdomain_replies;
sigma_latency += serv1->query_latency;
count_latency++;
}
port = prettyprint_addr(&serv->addr, daemon->addrbuff);
my_syslog(LOG_INFO, _("server %s#%d: queries sent %u, retried or failed %u, nxdomain replies %u"),
daemon->addrbuff, port, queries, failed_queries, nxdomain_replies);
my_syslog(LOG_INFO, _("server %s#%d: queries sent %u, retried or failed %u, nxdomain replies %u, avg. latency %ums"),
daemon->addrbuff, port, queries, failed_queries, nxdomain_replies, sigma_latency/count_latency);
}
if (option_bool(OPT_DEBUG) || option_bool(OPT_LOG))