Closed
Bug 101165
Opened 23 years ago
Closed 23 years ago
GETing parts of page twice
Categories
(Core :: Networking: Cache, defect)
Tracking
()
mozilla0.9.7
People
(Reporter: jmd, Assigned: gordon)
References
()
Details
(Keywords: perf)
http://news.bbc.co.uk/ has a total of 48 items on it (html, css, gif, jpeg). I emptied my cache, disabled disk cache, and restarted. I traced the network as mozilla opened http://news.bbc.co.uk/. Two of the gif files were requested twice. / is request 1. /furniture/dotted_line.gif is request 8 AND 11. /furniture/nav/ukfs/languages.gif is request 9 AND 17. Not sure if this is a cache problem, or if something else should be picking it off.
Reporter | ||
Comment 1•23 years ago
|
||
Correction, on that first test, THREE gifs were requested twice. So there are 47 objects only on that page. This time, Mozilla sent 53 GETs. 4 files were requested twice, and /furniture/grey_pixel.gif was requested THREE times, two of those three requests were within a few tenths of a second, so it's not as if it gave up on the first attempt (I'm on a decently fast connection, cable).
Keywords: perf
If you disabled the disk cache, HTTP would try to use the memory cache. However, ImgLib is also using the memory cache, which is by default set to 4 Mb. I set my disk cache capacity to zero, increased my memory cache capacity to 20 Mb, and visited the site. The memory cache filled with about 9 Mb of data (from both HTTP, and ImgLib - including chrome images). If your memory cache is set less than 9 Mb for that page, and you have disabled the disk cache, I would expect multiple GET requests to be made.
Status: NEW → RESOLVED
Closed: 23 years ago
Resolution: --- → INVALID
Reporter | ||
Comment 3•23 years ago
|
||
Hate to disagree, but...
My cache previously was 8M (8*1024K). I set it to 16*1024, restarted, and again,
3 images were requested twice. I set it to 32*1024, restarted, and AGAIN 3
images were requested twice.
I checked about:cache and it's definatly not full:
Number of entries: 139
Maximum storage size: 33554432 Bytes
Storage in use: 1178256 Bytes
I'm going to do one more dump, and make sure the multiple GETs I'm seeing aren't
due to TCP retransmits, which is the only other thing I can think of.
> from both HTTP, and ImgLib - including chrome images
if internal browser stuff is consuming the same cache, the description definatly
should mention that. It only says the cache is used for "web pages", which will
lead to people like myself not factoring in room for that. If I set mem cache to
8M, i expect 8M worth of web page html and img's to be cached, not for the
browser to suck up half that for it's UI.
Status: RESOLVED → REOPENED
Resolution: INVALID → ---
Reporter | ||
Comment 4•23 years ago
|
||
OK, this is definatly happening. Here's two TCP connections that happened. All I did was start up moz (32M memory cache), then go straight to the url (bbc news). GET /furniture/top_bbc_logo.gif HTTP/1.1 Host: news.bbc.co.uk User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4+) Gecko/20010922 Accept: text/xml, application/xml, application/xhtml+xml, text/html;q=0.9, image/png, image/jpeg, image/gif;q=0.2, text/plain;q=0.8, text/css, */*;q=0.1 Accept-Language: en-us Accept-Encoding: gzip, deflate, compress;q=0.9 Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66 Keep-Alive: 300 Connection: keep-alive Cookie: SITESERVER=ID=6ab15483aa310e84194cbde837312024 Referer: http://news.bbc.co.uk/ HTTP/1.1 200 OK Date: Mon, 24 Sep 2001 23:25:50 GMT Server: Apache/1.3.14 (Unix) Last-Modified: Tue, 07 Aug 2001 16:51:00 GMT ETag: "40938b-be-3b701c74" Accept-Ranges: bytes Content-Length: 190 Connection: close Content-Type: image/gif GIF89a/data blah blah blah blah GET /furniture/top_bbc_logo.gif HTTP/1.1 Host: news.bbc.co.uk User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4+) Gecko/20010922 Accept: text/xml, application/xml, application/xhtml+xml, text/html;q=0.9, image/png, image/jpeg, image/gif;q=0.2, text/plain;q=0.8, text/css, */*;q=0.1 Accept-Language: en-us Accept-Encoding: gzip, deflate, compress;q=0.9 Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66 Keep-Alive: 300 Connection: keep-alive Cookie: SITESERVER=ID=6ab15483aa310e84194cbde837312024 Referer: http://news.bbc.co.uk/ HTTP/1.1 200 OK Date: Mon, 24 Sep 2001 23:25:47 GMT Server: Apache/1.3.14 (Unix) Last-Modified: Tue, 07 Aug 2001 16:51:00 GMT ETag: "40938b-be-3b701c74" Accept-Ranges: bytes Content-Length: 190 Connection: close Content-Type: image/gif GIF89a/dckhfsdkghdhgdfg dfg dfg Notice there are 3 seconds between the requests. Notice mozilla asked for keepalive, bbc denied. Here's the order of GETs, that time: GET / GET /stylesheets/corenews.css GET /furniture/top_bbc_logo.gif GET /furniture/nothing.gif GET /furniture/nav/lhs_sitepuffs/news_event.gif GET /furniture/top_bbc_logo.gif GET /furniture/nothing.gif GET /furniture/nav/lhs_sitepuffs/news_event.gif GET /furniture/nav/lhs_sitepuffs/weather.gif GET /furniture/dotted_line.gif GET /furniture/nav/ukfs/languages.gif You can see three duplicate files in there... /furniture/nav/lhs_sitepuffs/news_event.gif /furniture/nothing.gif /furniture/top_bbc_logo.gif
Reporter | ||
Comment 5•23 years ago
|
||
Err, I pasted those in backwards, :47 then :50, obviously. Note the data is the same in both, i just typed in some stuff there, since it's binary in the original copy. Another clarification, that GET list is cut off... there were 50 (for 47 objects), I just pasted the top as thats where all the dupes happened to be, this time. Sometimes they happen lower, even right by the bottom. Seems fairly random.
Reporter | ||
Comment 6•23 years ago
|
||
Here's an interesting thing... those files are listed twice in about:cache?device=mem, with differant sizes: Key: http://news.bbc.co.uk/furniture/top_bbc_logo.gif Data size: 1520 Bytes Fetch count: 1 Last Modified: Mon Sep 24 18:23:05 2001 Expires: Sat Sep 29 14:14:34 2001 Key: http://news.bbc.co.uk/furniture/top_bbc_logo.gif Data size: 190 Bytes Fetch count: 1 Last Modified: Mon Sep 24 18:23:05 2001 Expires: Sat Sep 29 14:14:34 2001 Key: http://news.bbc.co.uk/furniture/nothing.gif Data size: 8 Bytes Fetch count: 45 Last Modified: Mon Sep 24 18:23:05 2001 Expires: Sun Sep 30 09:44:36 2001 Key: http://news.bbc.co.uk/furniture/nothing.gif Data size: 43 Bytes Fetch count: 1 Last Modified: Mon Sep 24 18:23:05 2001 Expires: Sun Sep 30 09:44:36 2001 Have fun with this one, bub. :-)
The reason the files are listed twice is because one of the listings in about:cache is for HTTP and the other is for ImgLib (which uses very similar looking keys). ImgLib stores the decoded image. If you click on the cache entry, you will get an expanded view that contains more information about it. I misread my "Storage in use" figure. It wasn't 9 Mb, but rather just short of 1 Mb (man, I'd really like to put the appropriate localized number breaks in there). Darin, any ideas why we would be requesting three of these files more than once?
Comment 8•23 years ago
|
||
pavlov could help with this... are images requested multiple times only when the user presses reload or shift-reload?
Hopefully, I'll get some attention from Pav in the 0.9.6 timeframe.
Target Milestone: --- → mozilla0.9.6
Assignee | ||
Comment 10•23 years ago
|
||
Targeting for necko performance milestone 0.9.7.
Target Milestone: mozilla0.9.6 → mozilla0.9.7
Assignee | ||
Comment 11•23 years ago
|
||
This looks like bug 92722. Marking duplicate. *** This bug has been marked as a duplicate of 92722 ***
Status: REOPENED → RESOLVED
Closed: 23 years ago → 23 years ago
Resolution: --- → DUPLICATE
You need to log in
before you can comment on or make changes to this bug.
Description
•