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authorjar@chromium.org <jar@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>2010-03-20 05:41:42 +0000
committerjar@chromium.org <jar@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>2010-03-20 05:41:42 +0000
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2 experiments: DNS prefetch limit concurrency: TCP split a packet
Some firewalls apparently try to preclude a "syn flood to host" by limiting the number of syn's (used to open a TCP/IP socket) that are outstanding without having received a syn-ack. Presumably this is to prevent a user from participating in a syn-flood attack (which traditional sends a lot of syn packets, with false return addresses, resulting in no responses). Apparently this firewall technology has in some cases been extended to include UDP sessions for which there has been no response, and this may include DNS resolutions. Since the prefetcher currently resolves as many as 8 names simultaneously, this is remarkably close to the reported threshold of 10 un-answered connections. This test attempts to limit connections to 2, 4, or 6, so that we can see if this helps users. In TCP, the RTO remains (under windows) at a full 3 seconds until after the first ack is received. As a result, if the first data packet sent (after the SYN) is lost, then TCP won't resend until after 3 seconds without an ack. As a test, we split up the first packet into two parts (the second part containing only one byte). This is done as an A/B test, and we'll see if we get a measurable improvement in page-load-time latency. Finally, to get better page load stats, I adjusted the PLT histograms so that we record a "final" time for abandoned pages when they are closed (even if they didn't finish rendering, etc.). This should give a much more fair PLT comparison for all network latency experiments. BUG=3041 BUG=12754 r=mbelshe,darin Review URL: http://codereview.chromium.org/1088002 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42181 0039d316-1c4b-4281-b951-d872f2087c98
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