Comment #4 on issue 25472 by [email protected]: Investigate optimal
values for HostCache
http://code.google.com/p/chromium/issues/detail?id=25472
The following revision refers to this bug:
http://src.chromium.org/viewvc/chrome?view=rev&revision=34238
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r34238 | [email protected] | 2009-12-09 23:23:40 -0800 (Wed, 09 Dec 2009)
| 15 lines
Changed paths:
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/host_cache.cc?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/host_cache.h?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/host_cache_unittest.cc?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/host_resolver_impl.cc?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/host_resolver_impl.h?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/host_resolver_impl_unittest.cc?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/base/mock_host_resolver.cc?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/tools/hresolv/hresolv.cc?r1=34238&r2=34237
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http://src.chromium.org/viewvc/chrome/trunk/src/net/url_request/url_request_view_net_internals_job.cc?r1=34238&r2=34237
Cache failed DNS resolutions for 1 second.
This is a very small time to live, since we want to be able to respond
quickly when formerly unresolvable names become resolvable.
Even such a small time is still useful, since cache misses for unresolvable
names can be extremely costly (order of several seconds).
For example, in our corp PAC script, the URL's host is resolved 3 times, so:
Without caching, total runtime is (2.5 seconds) * 3 --> 7.5 seconds.
Whereas with caching it would be: (2.5 seconds) * 1 --> 2.5 seconds
This time to live will need to be tuned as part of bug 25472.
BUG=11079
Review URL: http://codereview.chromium.org/464084
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