lkml.org 
[lkml]   [2006]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: 2.6.15-rt4 failure with LATENCY_TRACE on x86_64
From
Date
On Thu, 2006-01-12 at 22:18 -0500, Steven Rostedt wrote:
> OK, I'm actually sending you this email on a x86_64 running
> 2.6.15-rt4-sr2, with latency tracing on. But unfortunately, I have a
> AMD X2 that each core has it's own tsc counter that is not in sync, and
> since the latency tracer uses tsc, I get garbage. But beware, the tsc
> does slow down when the cpu idles, so it gives bad results even for non
> x2 systems.
>
Hmm, I didn't realize that (I'm running on a uni-processor system). I
just pulled your rt4-sr2 patch and will apply/rebuild/test.

> I finally was able to boot this with using the PM timer, but the
> beginning of my dmesg is still filled with:
>
> read_tsc: ACK! TSC went backward! Unsynced TSCs?
>
> Have you tried booting with idle=poll? I wonder if that would help?

No, I thought that was strictly an SMP issue. I'll try it as well.

Thanks,
Clark

--
Clark Williams <williams@redhat.com>
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2006-01-13 16:08    [W:0.155 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site