Issue 3985: Omnibox is requesting "too many" DNS lookups during typing
http://code.google.com/p/chromium/issues/detail?id=3985
New issue report by [EMAIL PROTECTED]:
What steps will reproduce the problem?
1. Type something into the omnibox, such as maps.google.com
2. Visit about:dns
3. Observe that about 13 new entries have been listed under "Prefetching
DNS records revealed non-existance for ..."
4. If you have a debug build, you'll actually see a table of all possible
substrings of the entered text, each of which will have been resolved via
DNS.
This excessive use of DNS is surely purging the OS cache, and significantly
reducing performance when users type into the omnibox :-(. It is pretty
remarkable that the histogrammed performance is so good (the prefetcher
system actually detects probably cache evictions an works around them), but
I'm sure this is a significant performance loss.
The fix will hopefully be quite small, but the gains quite measurable.
I've put this to P1 and Mstone-1.0 to "get it on the radar," but Mark
should adjust it more correctly.
What is the expected output?
Per design (prior to regression?), I'd only see lookups for things with a
dot that were top-level-domains. For example, I would only see a false
lookup for "maps.google.co".
What do you see instead?
Far too many names :-(
The following is an example of my about:dns page for code just beyond the
tip of tree (its format is a little different, as it explicitly blames the
omnibox for these lookups):
Prefetching DNS records revealed non-existance for 15 hostnames
maps.google. 2318 2318 08:03 [omnibox]
maps. 2265 2265 08:01 [omnibox]
ebay.co 2496 2496 03:29 [omnibox]
maps.google.co 2581 2581 22:50 [omnibox]
microsoft.co 2949 2949 14:09 [omnibox]
www.msn.co 2475 2475 01:31 [omnibox]
myspace.co 2423 2423 07:00 [omnibox]
maps.g 2349 2349 08:01 [omnibox]
maps.go 2351 2351 08:01 [omnibox]
maps.goo 2336 2336 08:02 [omnibox]
maps.goog 2338 2338 08:02 [omnibox]
maps.googl 2346 2346 08:02 [omnibox]
maps.google 2308 2308 08:03 [omnibox]
ma 2336 2336 08:01 [omnibox]
maps 2262 2262 08:01 [omnibox]
Issue attributes:
Status: Untriaged
Owner: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED], [EMAIL PROTECTED]
Labels: Type-Bug Pri-1 OS-Windows Area-BrowserBackend Mstone-1.0
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