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overload mode: too many queries situation is detected and queries are dropped.

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git-svn-id: file:///svn/unbound/trunk@717 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2007-10-23 14:44:51 +00:00
parent 861483ac82
commit 298e1fd688
3 changed files with 7 additions and 17 deletions
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20
daemon/worker.c
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@ -765,30 +765,16 @@ worker_handle_request(struct comm_point* c, void* arg, int error,
server_stats_querymiss(&worker->stats, worker); server_stats_querymiss(&worker->stats, worker);
/* grab a work request structure for this new request */ /* grab a work request structure for this new request */
/* @@@ TODO implement overload mode */ if(worker->env.mesh->all.count > worker->request_size) {
if(0 && worker->env.mesh->all.count > worker->request_size) { verbose(VERB_ALGO, "Too many requests active. "
/* we could get this due to a slow tcp incoming query, "dropping incoming query.");
that started before we performed listen_pushback */
verbose(VERB_DETAIL, "worker: too many incoming requests "
"active. dropping incoming query.");
verbose(VERB_ALGO, "currently servicing %d of %d queries",
(int)worker->env.mesh->all.count,
(int)worker->request_size);
worker->stats.num_query_list_exceeded++; worker->stats.num_query_list_exceeded++;
comm_point_drop_reply(repinfo); comm_point_drop_reply(repinfo);
query_info_clear(&qinfo);
return 0; return 0;
} }
mesh_new_client(worker->env.mesh, &qinfo, mesh_new_client(worker->env.mesh, &qinfo,
ldns_buffer_read_u16_at(c->buffer, 2), ldns_buffer_read_u16_at(c->buffer, 2),
&edns, repinfo, *(uint16_t*)ldns_buffer_begin(c->buffer)); &edns, repinfo, *(uint16_t*)ldns_buffer_begin(c->buffer));
if(0) { /* TODO overload mode does not work yet. */
if(worker->env.mesh->all.count == worker->request_size) {
/* the max request number has been reached, stop accepting */
listen_pushback(worker->front);
}
}
worker_mem_report(worker, NULL); worker_mem_report(worker, NULL);
return 0; return 0;
} }

1
doc/Changelog
View file

@ -8,6 +8,7 @@
server is used; the fastest dnssec lame server is chosen. server is used; the fastest dnssec lame server is chosen.
- added test then when trust anchor cannot be primed (nodata), the - added test then when trust anchor cannot be primed (nodata), the
insecure mode from unbound works. insecure mode from unbound works.
- Fixup max queries per thread, any more are dropped.
22 October 2007: Wouter 22 October 2007: Wouter
- added donotquerylocalhost config option. Can be turned off for - added donotquerylocalhost config option. Can be turned off for

3
doc/unbound.conf.5
View file

@ -117,6 +117,9 @@ Must be set to a power of 2. Setting (close) to the number of cpus is a
reasonable guess. reasonable guess.
.It \fBnum-queries-per-thread:\fR <number> .It \fBnum-queries-per-thread:\fR <number>
The number of queries that every thread will service simultaneously. The number of queries that every thread will service simultaneously.
If more queries arrive that need servicing, they are dropped. This forces
the client to resend after a timeout; allowing the server time to work on
the existing queries. Default 1024.
.It \fBrrset-cache-size:\fR <number> .It \fBrrset-cache-size:\fR <number>
Number of bytes size of the RRset cache. Default is 4 megabytes. Number of bytes size of the RRset cache. Default is 4 megabytes.
.It \fBrrset-cache-slabs:\fR <number> .It \fBrrset-cache-slabs:\fR <number>