784586 - Lots of jank with unreliable network connection during browser network activity

Status: RESOLVED DUPLICATE of bug 781732

(Core :: Networking, defect)

Description

[ferongr]

Using the latest Win x86 Nightly, running on Windows 7 64bit. The network adapter is an Atheros-based PCI WiFi card.

I can reliable reproduce this on my daily profile when connecting to my AP over WiFi and positioning/blocking the antenna to read around -90dB of signal strength on inSSIDer. When the browser tries to do any kind of network activity the UI freezes for 3-4 seconds. I took profiled the jank with the SPS profiler extension.

http://people.mozilla.com/~bgirard/cleopatra/?report=5f2f4ee7d0df2526560ad4b283a2bd8efbf0ed57

I could try to reproduce using a clean profile and try to catch the jank again in the profiler if needed.

Comment 2

[Patrick McManus [:mcmanus]]

John, are you using a http or socks proxy of any kind?

Comment 3

[Patrick McManus [:mcmanus]]

good to have data here - thanks john.

your profile shows jank in 

ReadInternetOption (wininet)
nsWindowsProxySettings::GetProxyForURI/GetPACURI()
nsProtocolProxyService::Resolve()

Resolve() is a synchronous API that can block around pac file operations.

This is being worked on as bug 769764.

I am curious - do you have a PAC file in use (with or without a proxy) as I haven't been able to determine fully if windows would sometimes block on this while trying to discover one.

Comment 5

[ferongr]

I assume PAC Is Proxy Auto-Config.

The proxy setting is set to the "Use system proxy settings" option. Opening the Internet Explorer proxy settings ("LAN settings") the checkbox "Automatically detect settings" is checked. Both of those are default settings, this Windows installation is only 6 months old so I never touched them.

It's indeed a dupe of bug 781732 then.