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mass_dns: only scale back for initial requests

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Some requests just take longer; they may have lots of recursion or a
slow authoritative server. That won't change on retransmissions, so if
we treat all requests and retransmissions equally, we get a long tail of
retransmits with smaller and smaller capacity (parallelism). Instead, we
will use the initial-request period to determine server capacity and
then not change it during the retransmit phase.
This commit is contained in:
dmiller
2024-05-16 19:31:45 +00:00
parent 8b8c6fca4e
commit 50ceac5753
1 changed files with 2 additions and 2 deletions
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4
nmap_dns.cc
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@@ -582,7 +582,7 @@ static int deal_with_timedout_reads(bool adjust_timing) {
// If we've tried this server enough times, move to the next one // If we've tried this server enough times, move to the next one
if (read_timeouts[read_timeout_index][tpreq->tries] == -1) { if (read_timeouts[read_timeout_index][tpreq->tries] == -1) {
if (!adjusted) { if (!adjusted && tpreq->servers_tried == 0) {
servI->max_capacity = servI->capacity * 2; servI->max_capacity = servI->capacity * 2;
servI->capacity = (int) (servI->capacity * CAPACITY_MAJOR_DOWN_SCALE); servI->capacity = (int) (servI->capacity * CAPACITY_MAJOR_DOWN_SCALE);
check_capacities(&*servI); check_capacities(&*servI);
@@ -620,7 +620,7 @@ static int deal_with_timedout_reads(bool adjust_timing) {
servItemp->to_process.push_back(tpreq); servItemp->to_process.push_back(tpreq);
} }
} else { } else {
if (!adjusted) { if (!adjusted && tpreq->servers_tried == 0 && tpreq->tries <= 1) {
servI->max_capacity = servI->capacity * 4; servI->max_capacity = servI->capacity * 4;
servI->capacity = (int) (servI->capacity * CAPACITY_MINOR_DOWN_SCALE); servI->capacity = (int) (servI->capacity * CAPACITY_MINOR_DOWN_SCALE);
check_capacities(&*servI); check_capacities(&*servI);