Hello list,
I am experiencing very similar problems as the original poster. The
DNS resolution delays appear only in Chrome. I am not getting any
resolution failures, however the resolution happens somewhat in
"waves". I click on a link and nothing happens for several seconds.
Then suddenly most of the website appears and the browser starts
resolving more domain names from the opened website and waits again.
When I open more different websites in several tabs, the delay happens
in all tabs at the same moment. The timeframe when the domain name
resolution actually works is about 2 seconds long and if I try to open
any other website during this period, it appears without any delays.
And by the way, there are a few websites for which this problem never
happens and one of them is Google (all services).
I am running Chrome 2.0.170.0 on Win XP. DNS histogram attached.
--Petr
Histogram: DNS.IndependentNavigation recorded 632 samples, average =
6272.6, standard deviation = 5863.3 (flags = 0x1)
0 -
O
(1 = 0.2%)
1 -
O
(1 = 0.2%) {0.2%}
2
O
(0 = 0.0%) {0.3%}
3 --
O
(2 = 0.3%) {0.3%}
4 -----
O
(5 = 0.8%) {0.6%}
5 -------
O (12
= 1.9%) {1.4%}
7 -------
O (18
= 2.8%) {3.3%}
10 ----
O
(15 = 2.4%) {6.2%}
14 -
O
(5 = 0.8%) {8.5%}
19 ---
O
(12 = 1.9%) {9.3%}
26 --
O
(10 = 1.6%) {11.2%}
35 --
O
(11 = 1.7%) {12.8%}
47 --
O
(11 = 1.7%) {14.6%}
64 -
O
(5 = 0.8%) {16.3%}
87 --
O
(8 = 1.3%) {17.1%}
118 -
O
(6 = 0.9%) {18.4%}
160 -
O
(3 = 0.5%) {19.3%}
217 -
O
(3 = 0.5%) {19.8%}
294 -
O
(5 = 0.8%) {20.3%}
398 -
O
(3 = 0.5%) {21.0%}
539
O
(1 = 0.2%) {21.5%}
730
O
(1 = 0.2%) {21.7%}
989 ----
O
(19 = 3.0%) {21.8%}
1340
O
(0 = 0.0%) {24.8%}
1816
O
(2 = 0.3%) {24.8%}
2460 ...
4516
------------------------------------------------------------------------
O (330 = 52.2%) {25.2%}
6118 -------
O (32
= 5.1%) {77.4%}
8289
O
(1 = 0.2%) {82.4%}
11230 -----
O
(21 = 3.3%) {82.6%}
15215 -------------------
O (89 = 14.1%)
{85.9%}
20614 ...
Histogram: DNS.PrefetchCacheEvictionL recorded 206 samples, average =
5003.2, standard deviation = 3512.2 (flags = 0x1)
0 --
O
(1 = 0.5%)
1
O
(0 = 0.0%) {0.5%}
2 --
O
(1 = 0.5%) {0.5%}
3 ...
5 -
O
(1 = 0.5%) {1.0%}
7
O
(0 = 0.0%) {1.5%}
10 -
O
(2 = 1.0%) {1.5%}
14 --
O
(4 = 1.9%) {2.4%}
19
O
(0 = 0.0%) {4.4%}
26 --
O
(5 = 2.4%) {4.4%}
35 --
O
(4 = 1.9%) {6.8%}
47 -
O
(2 = 1.0%) {8.7%}
64 -
O
(2 = 1.0%) {9.7%}
87 --
O
(4 = 1.9%) {10.7%}
118 -
O
(3 = 1.5%) {12.6%}
160 ...
989
O
(1 = 0.5%) {14.1%}
1340 -
O
(3 = 1.5%) {14.6%}
1816 ...
4516
------------------------------------------------------------------------
O (158 = 76.7%) {16.0%}
6118 --
O
(4 = 1.9%) {92.7%}
8289
O
(0 = 0.0%) {94.7%}
11230 -
O
(3 = 1.5%) {94.7%}
15215 ----
O
(8 = 3.9%) {96.1%}
20614 ...
Histogram: DNS.PrefetchFoundNameL recorded 1350 samples, average =
3857.5, standard deviation = 2707.0 (flags = 0x1)
0 ...
14 -
O
(14 = 1.0%) {0.0%}
19 -
O
(14 = 1.0%) {1.0%}
26 ---
O
(36 = 2.7%) {2.1%}
35 -
O
(17 = 1.3%) {4.7%}
47 ----
O
(48 = 3.6%) {6.0%}
64 ------
O
(77 = 5.7%) {9.6%}
87 ---
O
(37 = 2.7%) {15.3%}
118 ----
O
(49 = 3.6%) {18.0%}
160 ---
O
(35 = 2.6%) {21.6%}
217 -
O
(15 = 1.1%) {24.2%}
294 -
O
(16 = 1.2%) {25.3%}
398 -
O
(12 = 0.9%) {26.5%}
539
O
(4 = 0.3%) {27.4%}
730
O
(0 = 0.0%) {27.7%}
989
O
(1 = 0.1%) {27.7%}
1340
O
(6 = 0.4%) {27.8%}
1816
O
(1 = 0.1%) {28.2%}
2460 ...
4516
------------------------------------------------------------------------
O (944 = 69.9%) {28.3%}
6118 -
O
(8 = 0.6%) {98.2%}
8289
O
(1 = 0.1%) {98.8%}
11230
O
(3 = 0.2%) {98.9%}
15215 -
O
(12 = 0.9%) {99.1%}
20614 ...
Histogram: DNS.PrefetchPositiveHitL recorded 8 samples, average =
512.9, standard deviation = 802.3 (flags = 0x1)
0 ...
4
------------------------------------------------------------------------
O (1 = 12.5%) {0.0%}
5 ...
14 --------------
O (1 =
12.5%) {12.5%}
19
O
(0 = 0.0%) {25.0%}
26 --------------
O (1 =
12.5%) {25.0%}
35 --------------
O (1 =
12.5%) {37.5%}
47
O
(0 = 0.0%) {50.0%}
64 --------------
O (1 =
12.5%) {50.0%}
87
O
(0 = 0.0%) {62.5%}
118 --------------
O (1 =
12.5%) {62.5%}
160 ...
1340 --------------
O (1 =
12.5%) {75.0%}
1816 --------------
O (1 =
12.5%) {87.5%}
2460 ...
Histogram: DNS.PrefetchQueue recorded 1479 samples, average = 4986.2,
standard deviation = 7949.6 (flags = 0x1)
0
------------------------------------------------------------------------
O (599 = 40.5%)
1
O
(2 = 0.1%) {40.5%}
2
O
(0 = 0.0%) {40.6%}
3
O
(1 = 0.1%) {40.6%}
4 ...
12
O
(1 = 0.1%) {40.7%}
14
O
(3 = 0.2%) {40.8%}
17
O
(1 = 0.1%) {41.0%}
20
O
(0 = 0.0%) {41.0%}
24
O
(2 = 0.1%) {41.0%}
29
O
(0 = 0.0%) {41.2%}
34
O
(2 = 0.1%) {41.2%}
40
O
(3 = 0.2%) {41.3%}
48
O
(1 = 0.1%) {41.5%}
57
O
(5 = 0.3%) {41.6%}
68
O
(5 = 0.3%) {41.9%}
81
O
(11 = 0.7%) {42.3%}
96
O
(5 = 0.3%) {43.0%}
114
O
(2 = 0.1%) {43.3%}
135
O
(6 = 0.4%) {43.5%}
160
O
(6 = 0.4%) {43.9%}
190
O
(11 = 0.7%) {44.3%}
226
O
(15 = 1.0%) {45.0%}
268
O
(9 = 0.6%) {46.0%}
318
O
(12 = 0.8%) {46.7%}
378
O
(6 = 0.4%) {47.5%}
449 -
O
(25 = 1.7%) {47.9%}
533
O
(4 = 0.3%) {49.6%}
633
O
(11 = 0.7%) {49.8%}
752
O
(10 = 0.7%) {50.6%}
894
O
(14 = 0.9%) {51.3%}
1062
O
(13 = 0.9%) {52.2%}
1262
O
(15 = 1.0%) {53.1%}
1500 -
O
(24 = 1.6%) {54.1%}
1782
O
(14 = 0.9%) {55.7%}
2117
O
(13 = 0.9%) {56.7%}
2516 -
O
(21 = 1.4%) {57.5%}
2990
O
(19 = 1.3%) {59.0%}
3553 -
O
(23 = 1.6%) {60.2%}
4222 -
O
(48 = 3.2%) {61.8%}
5017 --
O
(93 = 6.3%) {65.0%}
5961 -
O
(45 = 3.0%) {71.3%}
7083 -
O
(42 = 2.8%) {74.4%}
8416 -
O
(45 = 3.0%) {77.2%}
10000 -------
O
(292 = 19.7%) {80.3%}
Histogram: DNS.PrefetchReferredPositiveHit recorded 5 samples, average
= 78.2, standard deviation = 94.5 (flags = 0x1)
0 ...
24
------------------------------------------------------------------------
O (2 = 40.0%) {0.0%}
29
O
(0 = 0.0%) {40.0%}
34
------------------------------------------------------------------------
O (2 = 40.0%) {40.0%}
40 ...
226 ------------------------------------
O (1 = 20.0%) {80.0%}
268 ...
Histogram: DNS.UnexpectedResolutionL recorded 339 samples, average =
5531.9, standard deviation = 5632.7 (flags = 0x1)
0 ---
O
(1 = 0.3%)
1 ...
3 ---
O
(1 = 0.3%) {0.3%}
4 ---
O
(1 = 0.3%) {0.6%}
5 ----
O
(3 = 0.9%) {0.9%}
7 --------
O (9 =
2.7%) {1.8%}
10 ----
O
(6 = 1.8%) {4.4%}
14 --
O
(3 = 0.9%) {6.2%}
19 --
O
(3 = 0.9%) {7.1%}
26 --
O
(4 = 1.2%) {8.0%}
35 -----
O
(9 = 2.7%) {9.1%}
47 -------
O (13
= 3.8%) {11.8%}
64 ------
O
(11 = 3.2%) {15.6%}
87 ------
O
(11 = 3.2%) {18.9%}
118 ----
O
(7 = 2.1%) {22.1%}
160 ---
O
(6 = 1.8%) {24.2%}
217
O
(0 = 0.0%) {26.0%}
294 --
O
(4 = 1.2%) {26.0%}
398 -
O
(1 = 0.3%) {27.1%}
539 -
O
(1 = 0.3%) {27.4%}
730
O
(0 = 0.0%) {27.7%}
989 ---------
O (17 =
5.0%) {27.7%}
1340
O
(0 = 0.0%) {32.7%}
1816 ----
O
(7 = 2.1%) {32.7%}
2460 ...
4516
------------------------------------------------------------------------
O (141 = 41.6%) {34.8%}
6118 -------------
O (25 =
7.4%) {76.4%}
8289 -
O
(1 = 0.3%) {83.8%}
11230 ----------
O (19 =
5.6%) {84.1%}
15215 ------------------
O (35 = 10.3%)
{89.7%}
20614 ...
On Feb 12, 6:12 pm, Bob Doe <[email protected]> wrote:
> Here's myDNShistograms. I visited cnn.com, bbcnews.com, news.com.
> All three sites took an extremely long time to load, and the first two
> sites failedDNSlookup the first time, I had to hit the refresh
> button. I'm using Vmware Fusion 2 running windows XP, Chrome
> 1.0.154.48, with OpenDNS asDNShost. I do not see a problem with
> "UseDNSpre-fetching to improve page load performance" turned off
> under Vmware, and I also do not see this problem in non-vmware
> environment on my other windows XP laptop.
>
> Histogram:DNS.PrefetchCacheEviction recorded 4 samples, average =
> 8987.0, standard deviation = 8090.6 (flags = 0x1)
> 0 ...
> 533
> ------------------------------------------------------------------------
> O (1 = 25.0%) {0.0%}
> 633 ...
> 3553
> ------------------------------------------------------------------------
> O (1 = 25.0%) {25.0%}
> 4222 ...
> 8416
> ------------------------------------------------------------------------
> O (1 = 25.0%) {50.0%}
> 10000
> ------------------------------------------------------------------------
> O (1 = 25.0%) {75.0%}
>
> Histogram:DNS.PrefetchFoundNameL recorded 28 samples, average =
> 5403.7, standard deviation = 3934.2 (flags = 0x1)
> 0 ...
> 539 --------------
> O (1 = 3.6%)
> {0.0%}
> 730 --------------
> O (1 = 3.6%)
> {3.6%}
> 989 -----------------------------
> O (2 = 7.1%) {7.1%}
> 1340 --------------
> O (1 = 3.6%)
> {14.3%}
> 1816 -------------------------------------------
> O (3 = 10.7%) {17.9%}
> 2460 -------------------------------------------
> O (3 = 10.7%) {28.6%}
> 3333
> ------------------------------------------------------------------------
> O (5 = 17.9%) {39.3%}
> 4516 --------------
> O (1 = 3.6%)
> {57.1%}
> 6118
> ------------------------------------------------------------------------
> O (5 = 17.9%) {60.7%}
> 8289 ----------------------------------------------------------
> O (4 = 14.3%) {78.6%}
> 11230 -----------------------------
> O (2 = 7.1%) {92.9%}
> 15215 ...
>
> Histogram:DNS.PrefetchQueue recorded 32 samples, average = 527.7,
> standard deviation = 992.4 (flags = 0x1)
> 0
> ------------------------------------------------------------------------
> O (12 = 37.5%)
> 1 ------------------------------------------------
> O (8 = 25.0%) {37.5%}
> 2 ------
> O (1
> = 3.1%) {62.5%}
> 3 ...
> 5 ------------------
> O (3 = 9.4%)
> {65.6%}
> 6 ...
> 752 -
> O
> (1 = 3.1%) {75.0%}
> 894
> O
> (0 = 0.0%) {78.1%}
> 1062 -
> O
> (1 = 3.1%) {78.1%}
> 1262
> O
> (0 = 0.0%) {81.3%}
> 1500 -
> O
> (1 = 3.1%) {81.3%}
> 1782 -
> O
> (1 = 3.1%) {84.4%}
> 2117 -
> O
> (1 = 3.1%) {87.5%}
> 2516 --
> O
> (2 = 6.3%) {90.6%}
> 2990 -
> O
> (1 = 3.1%) {96.9%}
> 3553 ...
>
> Histogram:DNS.UnexpectedResolutionL recorded 27 samples, average =
> 4771.7, standard deviation = 6310.0 (flags = 0x1)
> 0
> ------------------------------------------------------------------------
> O (6 = 22.2%)
> 1 ...
> 294 -------
> O (3
> = 11.1%) {22.2%}
> 398 --
> O
> (1 = 3.7%) {33.3%}
> 539 -------
> O (3
> = 11.1%) {37.0%}
> 730 --
> O
> (1 = 3.7%) {48.1%}
> 989
> O
> (0 = 0.0%) {51.9%}
> 1340 -----
> O
> (2 = 7.4%) {51.9%}
> 1816 ...
> 3333 -----
> O
> (2 = 7.4%) {59.3%}
> 4516 --
> O
> (1 = 3.7%) {66.7%}
> 6118 --
> O
> (1 = 3.7%) {70.4%}
> 8289 -----
> O
> (2 = 7.4%) {74.1%}
> 11230 ----------
> O (4 =
> 14.8%) {81.5%}
> 15215
> O
> (0 = 0.0%) {96.3%}
> 20614 --
> O
> (1 = 3.7%) {96.3%}
> 27929 ...
>
> On Feb 10, 9:41 am, Jim Roskind <[email protected]> wrote:
>
> > Your browser is instrumented to reveal some data that would be helpful
> > in understanding this performance. Since you're seeing times greater
> > than 60 seconds, something big should show up. If possible, please
> > visit (in chromium):
>
> > about:histograms/DNS
>
> > You'll see a pile of ASCII art histograms, which reflect what has been
> > going on with regard toDNSfetching. None of the information should
> > be very confidential, so if possible, please cut/paste/post a copy
> > here for folks to look at.
>
> > It may, for example, be that theDNSresolver in Vmware is restricting
> > the the rate of resolutions, rather than allowing them to happen in
> > parallel. Without taxing most computers or networks, Chromium
> > currently tries to do up ot 8 resolutions in parallel. If this were a
> > problem, then you'd see a large average queueing delay (as resolutions
> > backed up into the queue) in the histogram labeledDNS.
> > PrefetchQueue. The median for that histogram should be tiny (around
> > 1ms), but the mean could be much larger if you visit pages with a LOT
> > of domains (wikipedia comes to mind). Even so, I'd be rather
> > surprised to hear about queuing delay over 1 second.
>
> > As a second example, for some reason yourDNSresolution time may be
> > terrible. If so, you'd see this in the histogram labeled
> >DNS.PrefetchFoundNameL (where I'd commonly expect to see a median
> > value around 85ms, and mean value up closer to 200-600ms). If you see
> > a long tail (resolutions larger than a second or two, meaning larger
> > than 1000-2000ms along the axis on the left), then there may be a
> > problem with your resolver or your network. I've seen especially long
> > tails in negative results (host not found) on networks when netbios
> > kicks in and does various work to broadcast in order to find local
> > hosts.
>
> > Again, please post a copy of your DNShistograms after you encounter
> > this problem.
>
> > Thanks,
>
> > Jim
>
> > On Feb 9, 8:06 pm, Bob Doe <[email protected]> wrote:
>
> > > I'm running Chrome under Vmware Fusion 2.0. If I have "UseDNSpre-
> > > fetching to improve page load performance" turned on, many websites I
> > > visit seem to stall for a long time (> 60 seconds) at "Resolving
> > > host..." before web pages are rendered. I have found other people on
> > > the web complain about the same problem, what is the underlying cause,
> > > and is there plan to fix this problem in upcoming releases?
--~--~---------~--~----~------------~-------~--~----~
Chromium Discussion mailing list: [email protected]
View archives, change email options, or unsubscribe:
http://groups.google.com/group/chromium-discuss
-~----------~----~----~----~------~----~------~--~---
