[tor-dev] Fwd: gettimeofday() Syscall Issues

[Libertas]

On 01/03/2015 02:36 AM, Yawning Angel wrote:
> This all is kind of a moot point because even if the relevant time
> calls did take ~2 usec it still doesn't explain the performance issues,
> and my curiosity is close to being exhausted.  But, for what it's worth.
> 
> Forcing the timecounter hardware source to "TSC" in my VM results in a
> saner value (~45 ns).  That said, I'm not sure if the clock source is
> actually sane.  A quick skim through the code suggests that there's a
> decent number of things that would keep the TSC from being used, though
> VirtualBox supports the P-state invariant TSC cpuid bit (Linux picks it
> up), so why I'm seeing this behavior eludes me.
> 
> Curiosity exhausted at this point,

Fair enough. I agree that this was less fruitful than we had originally
hoped.

Do you have any other suggestions for what the issue might be, or what
profiling tools I could use to find it? I'm eager to keep working on
this, but I don't know which direction I should take.

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