Re: [openib-general] [PATCH] udapl: PPC64 cpuinfo change
On Thu, Oct 06, 2005 at 11:01:21PM -0500, Troy Benjegerdes wrote: Oh boy is there some reason 'gettimeofday' does not work? In general, it doesn't work as well. Trying to infer timebase/clock/rtsc frequency is going to be a mess. Using cycle counters is quite portable today and provides accurate results (with caveats on it's use). I'm open to using the next best thing once it's clear the cycle counters do NOT work. Think cpus that dynamically change frequency.. Laptops do now.. how long before something with infiniband does and breaks this code horribly? (think embedded systems) I don't buy this argument. Most of the tests load the CPU and it essentially runs at a fixed frequency. A better argument is how to benchmark under virtualized environment. I think that is totally broken today regardless of what method one uses to measure time. There are a couple of implementations of gettimeofday fully in userspace that hide the details and still read the high-res hardware counters. Google for 'vDSO gettimeofday'. Well, I'm sure Michael is open to patches on this for userspace/perftest stuff and like wise for James Lentini for uDAPL. grant ___ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
[openib-general] [PATCH] udapl: PPC64 cpuinfo change
This patch in addition to PPC64 atomic function additions provides udapl support on PPC64 platform.
/proc/cpuinfo on PPC64 prints different label for processor speed.
Signed-off-by: Todd Bowman [EMAIL PROTECTED]
Index: userspace/dapl/test/dapltest/mdep/linux/dapl_mdep_user.c
===
--- userspace/dapl/test/dapltest/mdep/linux/dapl_mdep_user.c (revision 3547)
+++ userspace/dapl/test/dapltest/mdep/linux/dapl_mdep_user.c (working copy)
@@ -186,7 +186,12 @@
void )
{
#define DT_CPU_MHZ_BUFFER_SIZE 128
+
+#if defined (__PPC64__)
+#define DT_CPU_MHZ_MHZ clock
+#else
#define
DT_CPU_MHZ_MHZ
cpu MHz
+#endif
#define DT_CPU_MHZ_DELIMITER :
FILE *fp;
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Re: [openib-general] [PATCH] udapl: PPC64 cpuinfo change
On Thu, Oct 06, 2005 at 11:48:02AM -0600, Todd Bowman wrote: /proc/cpuinfo on PPC64 prints different label for processor speed. ... ISTR the clock value in cpuinfo is NOT the same as the CPU MHz. Can you remind me if clock value * mtfb results in wall clock time units? If not, then use of DT_CPU_MHZ_MHZ needs to be reviewed since it typically makes that assumption. Also, if someone cares about sparc (hey Tom! :^) ), then might leverage the get_clock.c code on: http://svn.gnumonks.org/trunk/mmio_test/ hth, grant ___ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
Re: [openib-general] [PATCH] udapl: PPC64 cpuinfo change
On Thu, Oct 06, 2005 at 02:14:08PM -0700, Grant Grundler wrote: On Thu, Oct 06, 2005 at 11:48:02AM -0600, Todd Bowman wrote: /proc/cpuinfo on PPC64 prints different label for processor speed. ... ISTR the clock value in cpuinfo is NOT the same as the CPU MHz. Can you remind me if clock value * mtfb results in wall clock time units? If not, then use of DT_CPU_MHZ_MHZ needs to be reviewed since it typically makes that assumption. Also, if someone cares about sparc (hey Tom! :^) ), then might leverage the get_clock.c code on: http://svn.gnumonks.org/trunk/mmio_test/ Oh boy is there some reason 'gettimeofday' does not work? Trying to infer timebase/clock/rtsc frequency is going to be a mess. Think cpus that dynamically change frequency.. Laptops do now.. how long before something with infiniband does and breaks this code horribly? (think embedded systems) There are a couple of implementations of gettimeofday fully in userspace that hide the details and still read the high-res hardware counters. Google for 'vDSO gettimeofday'. ___ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
