Re: test time-warps [was: Re: 2.6.14-rt13]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



* Steven Rostedt <[email protected]> wrote:

> > > Apparently that's the case.
> >
> > What about periodically re-syncing the TSCs on the cpus?  Are they
> > writeable?
> 
> I believe you can reset them to zero, but I don't think you can set 
> them to anything else.  I had to do something similar a few years ago, 
> and I don't have the specs in front of me, so this is coming straight 
> from memory.

on a reasonably new CPU you ought to be able to set the 64-bit value - 
but that doesnt change the fundamental fact: we have no idea how much 
time has passed while we were in HLT. Especially with things like 
dyntick/noidle we could spend _alot_ of time in HLT, and the TSC could 
drift significantly. How do we know how much that is?

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux