* stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D
@ 2002-12-04 12:29 Kay Diederichs
2002-12-04 13:45 ` Alan Cox
0 siblings, 1 reply; 6+ messages in thread
From: Kay Diederichs @ 2002-12-04 12:29 UTC (permalink / raw)
To: linux-kernel
[-- Attachment #1: Type: text/plain, Size: 2047 bytes --]
the subject says it all:
if I use the powersaving module amd76x_pm then the time is not kept. The
hardware is Asus A7M266-D with 2 MP1900 processors, BIOS is 1004 (but I
tried later BIOS versions as well).
Symptoms are:
- ping times vary and there are 'time of day goes back' messages:
64 bytes from xx (1.2.3.4): icmp_seq=4 ttl=64 time=19.549 msec
64 bytes from xx (1.2.3.4): icmp_seq=5 ttl=64 time=2.684 sec
Warning: time of day goes back, taking countermeasures.
64 bytes from xx (1.2.3.4): icmp_seq=6 ttl=64 time=9.799 msec
64 bytes from xx (1.2.3.4): icmp_seq=7 ttl=64 time=88 usec
64 bytes from xx (1.2.3.4): icmp_seq=8 ttl=64 time=20.011 msec
(addresses edited)
- ntpq -p shows a very high jitter:
remote refid st t when poll reach delay offset
jitter
==============================================================================
loop8.biologie. 134.34.3.18 2 u 6 64 77 0.807 -1920.6
1804.31
helix1.biologie 134.34.3.18 2 u 13 64 77 0.348 -1914.9
1803.99
- ntpd complains:
Dec 3 19:18:51 turn22 ntpd[730]: synchronisation lost
Dec 3 20:12:15 turn22 ntpd[730]: synchronisation lost
Dec 3 22:50:40 turn22 ntpd[730]: synchronisation lost
Dec 3 23:01:18 turn22 ntpd[730]: synchronisation lost
- the program 'check_time' (attached) which was once posted by R.
Johnson on this list shows that the internal timekeeping is
inconsistent:
Time = 3dedf443
Last = 3dedf440
Time = 3dedf440
Last = 3dedf443
Time = 3dedf443
Last = 3dedf440
Time = 3dedf440
Last = 3dedf443
Time = 3dedf443
Last = 3dedf440
Time = 3dedf440
Last = 3dedf443
Time = 3dedf443
Last = 3dedf440
Time = 3dedf440
Any ideas? Am I really the only one who has seen these problems (on 4
identical machines, BTW)?
Kay
--
Kay Diederichs http://strucbio.biologie.uni-konstanz.de/~kay
email: Kay.Diederichs@uni-konstanz.de Tel +49 7531 88 4049 Fax 3183
When replying to my email, please remove the blanks before and after the
"@" !
Fakultaet fuer Biologie, Universitaet Konstanz, Box M656, D-78457
Konstanz
[-- Attachment #2: check_time.c --]
[-- Type: text/plain, Size: 443 bytes --]
#include <stdio.h>
#include <time.h>
int main()
{
time_t tim;
time_t last;
(void)time(&last);
(void)time(&tim);
for(;;)
{
(void)time(&tim);
if(tim != last)
{
if((last +1) != tim)
{
fprintf(stderr,"Time = %08lx\n", tim);
fprintf(stderr,"Last = %08lx\n", last);
}
last = tim;
}
}
}
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D
2002-12-04 12:29 stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D Kay Diederichs
@ 2002-12-04 13:45 ` Alan Cox
2002-12-04 13:22 ` Pedro Larroy
2002-12-05 10:13 ` Kay Diederichs
0 siblings, 2 replies; 6+ messages in thread
From: Alan Cox @ 2002-12-04 13:45 UTC (permalink / raw)
To: Kay Diederichs; +Cc: Linux Kernel Mailing List
On Wed, 2002-12-04 at 12:29, Kay Diederichs wrote:
> the subject says it all:
>
> if I use the powersaving module amd76x_pm then the time is not kept. The
> hardware is Asus A7M266-D with 2 MP1900 processors, BIOS is 1004 (but I
> tried later BIOS versions as well).
Boot with "notsc". Unfortunately I dont think there is a way I can make
the module turn off tsc at runtime.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D
2002-12-04 13:45 ` Alan Cox
@ 2002-12-04 13:22 ` Pedro Larroy
2002-12-04 14:33 ` Alan Cox
2002-12-05 10:13 ` Kay Diederichs
1 sibling, 1 reply; 6+ messages in thread
From: Pedro Larroy @ 2002-12-04 13:22 UTC (permalink / raw)
To: Linux Kernel Mailing List
On Wed, Dec 04, 2002 at 01:45:31PM +0000, Alan Cox wrote:
> On Wed, 2002-12-04 at 12:29, Kay Diederichs wrote:
> > the subject says it all:
> >
> > if I use the powersaving module amd76x_pm then the time is not kept. The
> > hardware is Asus A7M266-D with 2 MP1900 processors, BIOS is 1004 (but I
> > tried later BIOS versions as well).
>
> Boot with "notsc". Unfortunately I dont think there is a way I can make
> the module turn off tsc at runtime.
>
Hi
I've had the same issues and a lot of overruns in eth0 plus bandwith
decreased to one tenth. Does this happen because disconnecting the athlon
FSB makes impossible for the ethernet interface to perform dma on memory?
Regards.
--
O _____________________________________________________________ O
| /-| Pedro Larroy Tovar. PiotR | http://omega.resa.es/piotr |-\ |
| /--| No MS-Office attachments please. |--\ |
o-|--| e-mail: piotr@omega.resa.es |--|-o
\-| finger piotr@omega.resa.es for public key and info |-/
-------------------------------------------------------------
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D
2002-12-04 13:22 ` Pedro Larroy
@ 2002-12-04 14:33 ` Alan Cox
0 siblings, 0 replies; 6+ messages in thread
From: Alan Cox @ 2002-12-04 14:33 UTC (permalink / raw)
To: Pedro Larroy; +Cc: Linux Kernel Mailing List
On Wed, 2002-12-04 at 13:22, Pedro Larroy wrote:
> I've had the same issues and a lot of overruns in eth0 plus bandwith
> decreased to one tenth. Does this happen because disconnecting the athlon
> FSB makes impossible for the ethernet interface to perform dma on memory?
The system has to wake back up at that point. There are some tunables in
the module if you want to play
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D
2002-12-04 13:45 ` Alan Cox
2002-12-04 13:22 ` Pedro Larroy
@ 2002-12-05 10:13 ` Kay Diederichs
2002-12-05 17:39 ` Alan Cox
1 sibling, 1 reply; 6+ messages in thread
From: Kay Diederichs @ 2002-12-05 10:13 UTC (permalink / raw)
To: linux-kernel; +Cc: Alan Cox
Alan Cox wrote:
>
> On Wed, 2002-12-04 at 12:29, Kay Diederichs wrote:
> > the subject says it all:
> >
> > if I use the powersaving module amd76x_pm then the time is not kept. The
> > hardware is Asus A7M266-D with 2 MP1900 processors, BIOS is 1004 (but I
> > tried later BIOS versions as well).
>
> Boot with "notsc". Unfortunately I dont think there is a way I can make
> the module turn off tsc at runtime.
To use "notsc" I had to set CONFIG_X86_TSC_DISABLE=y , but then init
fails (booting stops after freeing some kernel memory). Configure.help
says one has to install a TSC-checking glibc if that happens; I
installed the latest glibc-2.2.4-31 from redhat/7.2/updates but still
init fails. Are there RH7.2 compatible versions of glibc which are
TSC-checking?
I also tried
echo 01 >/proc/irq/0/smp_affinity
and it seems to improve the situation but I'm not sure if this is a good
workaround.
Kay
--
Kay Diederichs http://strucbio.biologie.uni-konstanz.de/~kay
email: Kay.Diederichs @ uni-konstanz.de Tel +49 7531 88 4049 Fax 3183
When replying to my email, please remove the blanks before and after the
"@" !
Fakultaet fuer Biologie, Universitaet Konstanz, Box M656, D-78457
Konstanz
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2002-12-05 16:58 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2002-12-04 12:29 stock 2.4.20: loading amd76x_pm makes time jiggle on A7M266-D Kay Diederichs
2002-12-04 13:45 ` Alan Cox
2002-12-04 13:22 ` Pedro Larroy
2002-12-04 14:33 ` Alan Cox
2002-12-05 10:13 ` Kay Diederichs
2002-12-05 17:39 ` Alan Cox
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