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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/dns/host_resolver.h" | 5 #include "net/dns/host_resolver.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "base/metrics/field_trial.h" | 8 #include "base/metrics/field_trial.h" |
9 #include "base/strings/string_number_conversions.h" | 9 #include "base/strings/string_number_conversions.h" |
10 #include "base/strings/string_split.h" | 10 #include "base/strings/string_split.h" |
11 #include "net/dns/dns_client.h" | 11 #include "net/dns/dns_client.h" |
12 #include "net/dns/dns_config_service.h" | 12 #include "net/dns/dns_config_service.h" |
13 #include "net/dns/host_cache.h" | 13 #include "net/dns/host_cache.h" |
14 #include "net/dns/host_resolver_impl.h" | 14 #include "net/dns/host_resolver_impl.h" |
15 | 15 |
16 namespace net { | 16 namespace net { |
17 | 17 |
18 namespace { | 18 namespace { |
19 | 19 |
20 // Maximum of 6 concurrent resolver threads (excluding retries). | 20 // Maximum of 6 concurrent resolver threads (excluding retries). |
21 // Some routers (or resolvers) appear to start to provide host-not-found if | 21 // Some routers (or resolvers) appear to start to provide host-not-found if |
22 // too many simultaneous resolutions are pending. This number needs to be | 22 // too many simultaneous resolutions are pending. This number needs to be |
23 // further optimized, but 8 is what FF currently does. We found some routers | 23 // further optimized, but 8 is what FF currently does. We found some routers |
24 // that limit this to 6, so we're temporarily holding it at that level. | 24 // that limit this to 6, so we're temporarily holding it at that level. |
25 const size_t kDefaultMaxProcTasks = 6u; | 25 const size_t kDefaultMaxProcTasks = 6u; |
26 | 26 |
27 // When configuring from field trial, do not allow | |
28 const size_t kSaneMaxProcTasks = 20u; | |
29 | |
30 PrioritizedDispatcher::Limits GetDispatcherLimits( | 27 PrioritizedDispatcher::Limits GetDispatcherLimits( |
31 const HostResolver::Options& options) { | 28 const HostResolver::Options& options) { |
32 PrioritizedDispatcher::Limits limits(NUM_PRIORITIES, | 29 PrioritizedDispatcher::Limits limits(NUM_PRIORITIES, |
33 options.max_concurrent_resolves); | 30 options.max_concurrent_resolves); |
34 | 31 |
35 // If not using default, do not use the field trial. | 32 // If not using default, do not use the field trial. |
36 if (limits.total_jobs != HostResolver::kDefaultParallelism) | 33 if (limits.total_jobs != HostResolver::kDefaultParallelism) |
37 return limits; | 34 return limits; |
38 | 35 |
39 // Default, without trial is no reserved slots. | 36 // Default, without trial is no reserved slots. |
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134 // static | 131 // static |
135 scoped_ptr<HostResolver> | 132 scoped_ptr<HostResolver> |
136 HostResolver::CreateDefaultResolver(NetLog* net_log) { | 133 HostResolver::CreateDefaultResolver(NetLog* net_log) { |
137 return CreateSystemResolver(Options(), net_log); | 134 return CreateSystemResolver(Options(), net_log); |
138 } | 135 } |
139 | 136 |
140 HostResolver::HostResolver() { | 137 HostResolver::HostResolver() { |
141 } | 138 } |
142 | 139 |
143 } // namespace net | 140 } // namespace net |
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