RE: [squid-users] Squid 3.x very slow loading on ireport.cnn.com
Already did use Wireshark. Here is some more info: If you look through the traces you'll notice that at some point Squid sends a TCP [FIN, ACK] right in the middle of a connection for seemingly no reason. (Attempting to close the connection) The server ignores this and sends the rest of the data, which Squid responds to with TCP RST (request to reset) since it now believes the connection to be closed. From the browser side it seems to be given no notification that the connection was closed (and indeed I can see no reason why it should be closed) so it seems to sit around doing nothing as it may have reached the max connections limit. After about 2 minutes (possibly related to a persistent connection timeout limit in squid) Squid seems to terminate all the connections with FIN,ACKs. The browser then seems to realize its connections are gone and it requests the remaining resources resulting in a bunch of TCP SYNs followed by the rest of the resources. Why it does this in the middle of connections we still have no clue, however turning off server_persistent_connections seems to make it load fast. However this is probably a bad idea in general... Max -Original Message- From: Henrik Nordström [mailto:hen...@henriknordstrom.net] Sent: Sunday, January 23, 2011 7:16 PM To: Max Feil Cc: squid-users@squid-cache.org Subject: RE: [squid-users] Squid 3.x very slow loading on ireport.cnn.com tor 2011-01-20 klockan 02:50 -0500 skrev Max Feil: Thanks. I am looking at the squid access.log and the delay is caused by a GET which for some reason does not result in a response from the server. Either there is no response or Squid is missing the response. After a 120 second time-out the page continues loading, but the end result may be malformed due to the object which did not load. I would take a peek at the traffic using wireshark to get some insight in what is going on there. REgards Henrik
[squid-users] Squid 3.x very slow loading on ireport.cnn.com
I'm wondering if anybody knows what might be causing this. I've confirmed this problem in linux builds of Squid 3.0, 3.1.1, 3.1.10 and 3.2.0.4. Using firefox (or probably any browser - it also happens in a webkit based browser under development) clear the browser's disk cache and try to load or reload http://ireport.cnn.com (with proxy address/port set to Squid of course). Loading the page takes a very long time (several minutes) even on a fast network connection. Take Squid out of the mix and everything loads in seconds. This is using the default squid.conf file. The problem does not happen in Squid 2.7! Thanks, Max
RE: [squid-users] Squid 3.x very slow loading on ireport.cnn.com
Thanks. I am looking at the squid access.log and the delay is caused by a GET which for some reason does not result in a response from the server. Either there is no response or Squid is missing the response. After a 120 second time-out the page continues loading, but the end result may be malformed due to the object which did not load. The error object is different every time and seems random! So the page never loads properly with Squid 3.x and takes about 125 seconds to load. It always loads properly without Squid and takes about 5 seconds to load. It always loads properly using Squid 2.7 and takes about 5 seconds to load. For consistency in tracking the problem down, I have Squid's disk and memory caches disabled so every client request is a cache miss. Strange eh? Max P.S. I am debugging natively on my Ubuntu 10.10 64 bit laptop using Firefox, but the original problem comes from an embedded device running the QNX RTOS using a libcurl based WebKit browser (both the browser and Squid are running on 127.0.0.1 in each case, but this problem happens across the network as well). -Original Message- From: Amos Jeffries [mailto:squ...@treenet.co.nz] Sent: Wednesday, January 19, 2011 9:18 PM To: squid-users@squid-cache.org Subject: Re: [squid-users] Squid 3.x very slow loading on ireport.cnn.com On 20/01/11 13:31, Max Feil wrote: I'm wondering if anybody knows what might be causing this. I've confirmed this problem in linux builds of Squid 3.0, 3.1.1, 3.1.10 and 3.2.0.4. Using firefox (or probably any browser - it also happens in a webkit based browser under development) clear the browser's disk cache and try to load or reload http://ireport.cnn.com (with proxy address/port set to Squid of course). Loading the page takes a very long time (several minutes) even on a fast network connection. Take Squid out of the mix and everything loads in seconds. This is using the default squid.conf file. The problem does not happen in Squid 2.7! Thanks, Max There are 101 different objects assembled into that one page coming from 10 different domains. Browsers set a very low limit on the amount of connections and objects fetched in parallel when using a proxy as compared to going direct. Large pages like this make the speed difference more noticeable. That will account for some of the extra time. But should not be taking that much longer. You will need to find out which objects are taking too long (firebug or the webkit dev tools should help) and then figure out why them. Amos -- Please be using Current Stable Squid 2.7.STABLE9 or 3.1.10 Beta testers wanted for 3.2.0.4
