gmane.os.netbsd.devel.smp

Performance Monitoring Counters (PMC, PERFCTRS) and SMP?

Greg A. Woods — 2011-10-16T03:32:26

Is anyone by any chance working on SMP support for PMC / PERFCTRS?

Apparently FreeBSD is now able to support PMC on SMP machines, but I
can't find any hint of anything related for NetBSD.

I ask mostly because I'm flustered by getrusage(2) being as good as
useless for even the most basic of benchmarking purposes, and
gettimeofday() also being useless in a multi-user environment.

I guess a second question might be if anyone's thought of pulling over
FreeBSD's fix, or re-implementing something similar, to at least make
getrusage() monotonic?

(on a related note, does anyone know of any decent CPU measurement tool
for use inside a process on OS X?  getrusage() is broken there too.)

Re: state of NetBSD SMP

David Holland — 2010-04-28T20:21:10

 > > Actually the network code is probably much harder ...
 > 
 > But, I'd argue, much more urgently needed than the TTY code. How
 > many bits get moved, as a percentage of system total, through each
 > subsystem?

indeed on both points, but I have no experience at all with the
network code and so I'm probably not doing it regardless...

Re: state of NetBSD SMP

Erik Fair — 2010-04-28T15:54:21

On Apr 28, 2010, at 05:43 , David Laight wrote:


But, I'd argue, much more urgently needed than the TTY code. How many bits get moved, as a percentage of system total, through each subsystem?

Erik <fair< at >netbsd.org>

Re: state of NetBSD SMP

David Laight — 2010-04-28T12:43:31

Ditto :-)

Actually the network code is probably much harder ...

David

Re: state of NetBSD SMP

David Holland — 2010-04-20T15:47:03

 > > So, what's the current state of NetBSD SMP, i.e. how many kernel  
 > > subsystems do we still have to get out from under the big lock?
 > 
 > No idea about total count, but top three of next things to attack:
 > 
 >  - audio (there is a branch, supposedly ~50% done)
 >  - networking
 >  - tty (noone dares to touch it?)

I dare, but my hands are full :(

Re: state of NetBSD SMP

Martin Husemann — 2010-04-19T18:17:27

No idea about total count, but top three of next things to attack:

 - audio (there is a branch, supposedly ~50% done)
 - networking
 - tty (noone dares to touch it?)

Martin

state of NetBSD SMP

Erik Fair — 2010-04-19T16:49:16

So, what's the current state of NetBSD SMP, i.e. how many kernel  
subsystems do we still have to get out from under the big lock?

curious,

Erik <fair< at >netbsd.org>

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