* tst-getcpu failure
@ 2007-05-12 7:42 Andreas Jaeger
2007-05-12 16:22 ` Ulrich Drepper
0 siblings, 1 reply; 6+ messages in thread
From: Andreas Jaeger @ 2007-05-12 7:42 UTC (permalink / raw)
To: GNU libc hackers
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tst-getcpu fails for me on x86-64:
getcpu results 14 not possible
This is one a one CPU system running Linux 2.6.18.
Btw. the following patch fixes a warning about a missing getpid
prototype. Ok to commit?
Andreas
2007-05-12 Andreas Jaeger <aj@suse.de>
* sysdeps/unix/sysv/linux/tst-getcpu.c: Include <unistd.h> for
getpid.
============================================================
Index: sysdeps/unix/sysv/linux/tst-getcpu.c
--- sysdeps/unix/sysv/linux/tst-getcpu.c 11 May 2007 06:37:33 -0000 1.1
+++ sysdeps/unix/sysv/linux/tst-getcpu.c 12 May 2007 07:38:47 -0000
@@ -1,6 +1,7 @@
#include <errno.h>
#include <stdio.h>
#include <sched.h>
+#include <unistd.h>
static int
--
Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj/
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
Maxfeldstr. 5, 90409 Nürnberg, Germany
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
[-- Attachment #2: Type: application/pgp-signature, Size: 188 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: tst-getcpu failure
2007-05-12 7:42 tst-getcpu failure Andreas Jaeger
@ 2007-05-12 16:22 ` Ulrich Drepper
2007-05-12 21:05 ` Andreas Jaeger
0 siblings, 1 reply; 6+ messages in thread
From: Ulrich Drepper @ 2007-05-12 16:22 UTC (permalink / raw)
To: Andreas Jaeger; +Cc: GNU libc hackers
Andreas Jaeger wrote:
> tst-getcpu fails for me on x86-64:
> getcpu results 14 not possible
AMD or Intel machine?
> Btw. the following patch fixes a warning about a missing getpid
> prototype. Ok to commit?
Yes.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA â–
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: tst-getcpu failure
2007-05-12 16:22 ` Ulrich Drepper
@ 2007-05-12 21:05 ` Andreas Jaeger
2007-05-12 21:09 ` Ulrich Drepper
0 siblings, 1 reply; 6+ messages in thread
From: Andreas Jaeger @ 2007-05-12 21:05 UTC (permalink / raw)
To: Ulrich Drepper; +Cc: GNU libc hackers
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Ulrich Drepper <drepper@redhat.com> writes:
> Andreas Jaeger wrote:
>> tst-getcpu fails for me on x86-64:
>> getcpu results 14 not possible
>
> AMD or Intel machine?
AMD64.
My 4 CPU AMD64 machine gives:
getcpu results 14 not possible
getcpu results 0 not possible
getcpu results 0 not possible
getcpu results 0 not possible
both running 2.6.18.
>
>
>
>> Btw. the following patch fixes a warning about a missing getpid
>> prototype. Ok to commit?
>
> Yes.
Thanks, will do now,
Andreas
--
Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj/
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
Maxfeldstr. 5, 90409 Nürnberg, Germany
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
[-- Attachment #2: Type: application/pgp-signature, Size: 188 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: tst-getcpu failure
2007-05-12 21:05 ` Andreas Jaeger
@ 2007-05-12 21:09 ` Ulrich Drepper
2007-05-13 18:15 ` Andreas Jaeger
0 siblings, 1 reply; 6+ messages in thread
From: Ulrich Drepper @ 2007-05-12 21:09 UTC (permalink / raw)
To: Andreas Jaeger; +Cc: GNU libc hackers
Andreas Jaeger wrote:
> My 4 CPU AMD64 machine gives:
> getcpu results 14 not possible
> getcpu results 0 not possible
> getcpu results 0 not possible
> getcpu results 0 not possible
So this is a 4 socket 4 core machine?
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA â–
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: tst-getcpu failure
2007-05-12 21:09 ` Ulrich Drepper
@ 2007-05-13 18:15 ` Andreas Jaeger
2007-05-13 18:19 ` Ulrich Drepper
0 siblings, 1 reply; 6+ messages in thread
From: Andreas Jaeger @ 2007-05-13 18:15 UTC (permalink / raw)
To: Ulrich Drepper; +Cc: Andreas Jaeger, GNU libc hackers
On Sat, May 12, 2007 at 02:09:19PM -0700, Ulrich Drepper wrote:
> Andreas Jaeger wrote:
> >My 4 CPU AMD64 machine gives:
> >getcpu results 14 not possible
> >getcpu results 0 not possible
> >getcpu results 0 not possible
> >getcpu results 0 not possible
>
> So this is a 4 socket 4 core machine?
2 sockets with 2 cores each.
cpu4 reports as:
processor : 3
vendor_id : AuthenticAMD
cpu family : 15
model : 33
model name : Dual Core AMD Opteron(tm) Processor 875
stepping : 0
cpu MHz : 2200.000
cache size : 1024 KB
physical id : 1
siblings : 2
core id : 1
cpu cores : 2
Note that my 1 CPU system fails as well - that was the original report,
Andreas
--
Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj/
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
Maxfeldstr. 5, 90409 Nürnberg, Germany
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: tst-getcpu failure
2007-05-13 18:15 ` Andreas Jaeger
@ 2007-05-13 18:19 ` Ulrich Drepper
0 siblings, 0 replies; 6+ messages in thread
From: Ulrich Drepper @ 2007-05-13 18:19 UTC (permalink / raw)
To: Andreas Jaeger; +Cc: GNU libc hackers
Andreas Jaeger wrote:
> 2 sockets with 2 cores each.
Then this...
>>> getcpu results 14 not possible
... is very wrong and should be reported as a kernel bug.
>>> getcpu results 0 not possible
>>> getcpu results 0 not possible
>>> getcpu results 0 not possible
This is probably the rdtscp instruction which doesn't need/use the cache
and is not reset.
The problem can be ignored for now. I think the kernel should adjust
the information when it explicitly reschedules a thread.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA â–
^ permalink raw reply [flat|nested] 6+ messages in thread
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2007-05-12 7:42 tst-getcpu failure Andreas Jaeger
2007-05-12 16:22 ` Ulrich Drepper
2007-05-12 21:05 ` Andreas Jaeger
2007-05-12 21:09 ` Ulrich Drepper
2007-05-13 18:15 ` Andreas Jaeger
2007-05-13 18:19 ` Ulrich Drepper
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