Hi, You probably need to filter ProcMon to just the thread that is using the CPU. Some people have had success with this: http://social.technet.microsoft.com/Forums/en-US/itprovistadesktopui/thread/9a109892-a473-4f5b-a2fe-f3c3b34deed8
stobject.dll, apparently, is the Systray Shell Service Object. Perhaps there is something running in the system tray that is causing the issue? Cheers Ken -----Original Message----- From: Ben Scott [mailto:mailvor...@gmail.com] Sent: Thursday, 13 August 2009 7:14 AM To: NT System Admin Issues Subject: Re: Network link state slow to propagate; UI freezes On Wed, Aug 12, 2009 at 7:54 AM, Fogarty, Richard R CTR USA USASOC <rick.foga...@us.army.mil> wrote: >> When plugging in or unplugging the network cable, the link state >> change does not propagate to the whole system immediately. >> Network-related UI elements may freeze until the system "notices" the >> change. > > How 'bout using ProcessMonitor to determine what's going on behind the > scenes while doing the same test? Gave that a shot. EXPLORER.EXE is using a lot of CPU time whenever I plug or unplug the network cable. Seems to be consistently around 40%. This is a dual-core laptop, so that's 80% of one core. It never goes to 100% of the core (50% system), which is interesting. If it was *just* sitting in a loop in userspace, it would use everything it could. That implies something more... maybe a repeated system call in a loop? Looking at the "threads" tab, "stobject.dll!DllCanUnloadNow+0x1995" seems to be what is using that CPU time. There's also a spike in context switch delta in SHWAPI.DLL which appears coincident with this. Anyone know WTH any of that means? :-) No other process appears to be doing anything significant. I compared to another laptop which is working fine: There is activity in those same threads when (un)plugging a net cable, but it is *much* less and *very* brief -- almost instantaneous. -- Ben ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
