[ kvm-Bugs-2826486 ] Clock speed in FreeBSD

[ kvm-Bugs-2826486 ] Clock speed in FreeBSD

[SourceForge.net]

Bugs item #2826486, was opened at 2009-07-24 11:16
Message generated for change (Comment added) made by aurel32
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: POLYMORF34 (polymorf34)
Assigned to: Nobody/Anonymous (nobody)
Summary: Clock speed in FreeBSD

Initial Comment:
I use KVM 88 and KVM 85 on Gentoo GNU/Linux 2.6.29, running on Intel Core2 CPU 6320 and Intel Xeon CPU E5405, both in 64 bits mode.
All gests running on FreeBSD 7.1-p5 in 64 bits with -smp 1. The first machine host only one gest.

The "sleep" command on FreeBSD does not work has expected. All sleep time are multiplied by 3

Example :

 freebsdmachine ~ # time sleep 1
real	0m3.148s
user	0m0.000s
sys	0m0.002s

freebsdmachine ~ # time sleep 10
real	0m31.429s
user	0m0.009s
sys	0m0.002s

With the "-no-kvm" flag, the "sleep" command works has expected.

----------------------------------------------------------------------

Comment By: Aurelien Jarno (aurel32)
Date: 2009-09-24 11:30

Message:
This is a regression introduced by this commit:

commit a7dfd4349f00e256a884b572f98c2c3be57ad212
Author: Marcelo Tosatti <mtosatti@redhat.com>
Date:   Wed Jan 21 13:07:00 2009 -0200

    KVM: x86: fix LAPIC pending count calculation

    Simplify LAPIC TMCCT calculation by using hrtimer provided
    function to query remaining time until expiration.

    Fixes host hang with nested ESX.

    Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
    Signed-off-by: Alexander Graf <agraf@suse.de>
    Signed-off-by: Avi Kivity <avi@redhat.com>


----------------------------------------------------------------------

Comment By: rmdir (rmdir)
Date: 2009-09-11 11:03

Message:
>Seems like there's a bug in one of the emulated timers. I worked around it
>with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag.

 -no-kvm-irqchip is not  real solution. On FreeBSD guest  it's  really
mess with smp > 1 (I don't know with other guest).
You can reproduce this by making a  du or fsck

date ; du -csh /usr/ports/ ; date #use date instead of time because of
this bug 
with :
-smp 2 => 32s
-smp 2 -no-kvm-irqchip => 4m28
-smp 1 -no-kvm-irqchip => 35s
-smp 1 => 35s
no options => 17s


 



----------------------------------------------------------------------

Comment By: Ed Swierk (eswierk)
Date: 2009-07-24 16:01

Message:
Seems like there's a bug in one of the emulated timers. I worked around it
with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag. 


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

[ kvm-Bugs-2826486 ] Clock speed in FreeBSD

[SourceForge.net]

Bugs item #2826486, was opened at 2009-07-24 11:16
Message generated for change (Comment added) made by aurel32
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: POLYMORF34 (polymorf34)
Assigned to: Nobody/Anonymous (nobody)
Summary: Clock speed in FreeBSD

Initial Comment:
I use KVM 88 and KVM 85 on Gentoo GNU/Linux 2.6.29, running on Intel Core2 CPU 6320 and Intel Xeon CPU E5405, both in 64 bits mode.
All gests running on FreeBSD 7.1-p5 in 64 bits with -smp 1. The first machine host only one gest.

The "sleep" command on FreeBSD does not work has expected. All sleep time are multiplied by 3

Example :

 freebsdmachine ~ # time sleep 1
real	0m3.148s
user	0m0.000s
sys	0m0.002s

freebsdmachine ~ # time sleep 10
real	0m31.429s
user	0m0.009s
sys	0m0.002s

With the "-no-kvm" flag, the "sleep" command works has expected.

----------------------------------------------------------------------

Comment By: Aurelien Jarno (aurel32)
Date: 2009-09-25 11:11

Message:
The following patch fixes the problem for me (already posted on the mailing
list).

>From 0dc540e09345ad5a1b99acbc92a7eab60029cec3 Mon Sep 17 00:00:00 2001
From: Aurelien Jarno <aurelien@aurel32.net>
Date: Fri, 25 Sep 2009 11:01:30 +0200
Subject: [PATCH] KVM: fix LAPIC timer period overflow

Don't overflow when computing the 64-bit period from 32-bit registers.

Fixes sourceforge bug #2826486.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 arch/x86/kvm/lapic.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 9c8f901..3ca7767 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -658,7 +658,7 @@ static void start_apic_timer(struct kvm_lapic *apic)
 {
 	ktime_t now = apic->lapic_timer.timer.base->get_time();
 
-	apic->lapic_timer.period = apic_get_reg(apic, APIC_TMICT) *
+	apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT) *
 		    APIC_BUS_CYCLE_NS * apic->divide_count;
 	atomic_set(&apic->lapic_timer.pending, 0);
 
-- 
1.6.4.3



----------------------------------------------------------------------

Comment By: Aurelien Jarno (aurel32)
Date: 2009-09-24 11:30

Message:
This is a regression introduced by this commit:

commit a7dfd4349f00e256a884b572f98c2c3be57ad212
Author: Marcelo Tosatti <mtosatti@redhat.com>
Date:   Wed Jan 21 13:07:00 2009 -0200

    KVM: x86: fix LAPIC pending count calculation

    Simplify LAPIC TMCCT calculation by using hrtimer provided
    function to query remaining time until expiration.

    Fixes host hang with nested ESX.

    Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
    Signed-off-by: Alexander Graf <agraf@suse.de>
    Signed-off-by: Avi Kivity <avi@redhat.com>


----------------------------------------------------------------------

Comment By: rmdir (rmdir)
Date: 2009-09-11 11:03

Message:
>Seems like there's a bug in one of the emulated timers. I worked around it
>with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag.

 -no-kvm-irqchip is not  real solution. On FreeBSD guest  it's  really
mess with smp > 1 (I don't know with other guest).
You can reproduce this by making a  du or fsck

date ; du -csh /usr/ports/ ; date #use date instead of time because of
this bug 
with :
-smp 2 => 32s
-smp 2 -no-kvm-irqchip => 4m28
-smp 1 -no-kvm-irqchip => 35s
-smp 1 => 35s
no options => 17s


 



----------------------------------------------------------------------

Comment By: Ed Swierk (eswierk)
Date: 2009-07-24 16:01

Message:
Seems like there's a bug in one of the emulated timers. I worked around it
with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag. 


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

[ kvm-Bugs-2826486 ] Clock speed in FreeBSD

[SourceForge.net]

Bugs item #2826486, was opened at 2009-07-24 11:16
Message generated for change (Comment added) made by rmdir
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: POLYMORF34 (polymorf34)
Assigned to: Nobody/Anonymous (nobody)
Summary: Clock speed in FreeBSD

Initial Comment:
I use KVM 88 and KVM 85 on Gentoo GNU/Linux 2.6.29, running on Intel Core2 CPU 6320 and Intel Xeon CPU E5405, both in 64 bits mode.
All gests running on FreeBSD 7.1-p5 in 64 bits with -smp 1. The first machine host only one gest.

The "sleep" command on FreeBSD does not work has expected. All sleep time are multiplied by 3

Example :

 freebsdmachine ~ # time sleep 1
real	0m3.148s
user	0m0.000s
sys	0m0.002s

freebsdmachine ~ # time sleep 10
real	0m31.429s
user	0m0.009s
sys	0m0.002s

With the "-no-kvm" flag, the "sleep" command works has expected.

----------------------------------------------------------------------

Comment By: rmdir (rmdir)
Date: 2009-09-11 11:03

Message:
>Seems like there's a bug in one of the emulated timers. I worked around it
>with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag.

 -no-kvm-irqchip is not  real solution. On FreeBSD guest  it's  really
mess with smp > 1 (I don't know with other guest).
You can reproduce this by making a  du or fsck

date ; du -csh /usr/ports/ ; date #use date instead of time because of
this bug 
with :
-smp 2 => 32s
-smp 2 -no-kvm-irqchip => 4m28
-smp 1 -no-kvm-irqchip => 35s
-smp 1 => 35s
no options => 17s


 



----------------------------------------------------------------------

Comment By: Ed Swierk (eswierk)
Date: 2009-07-24 16:01

Message:
Seems like there's a bug in one of the emulated timers. I worked around it
with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag. 


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

[ kvm-Bugs-2826486 ] Clock speed in FreeBSD

[SourceForge.net]

Bugs item #2826486, was opened at 2009-07-24 02:16
Message generated for change (Comment added) made by eswierk
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: POLYMORF34 (polymorf34)
Assigned to: Nobody/Anonymous (nobody)
Summary: Clock speed in FreeBSD

Initial Comment:
I use KVM 88 and KVM 85 on Gentoo GNU/Linux 2.6.29, running on Intel Core2 CPU 6320 and Intel Xeon CPU E5405, both in 64 bits mode.
All gests running on FreeBSD 7.1-p5 in 64 bits with -smp 1. The first machine host only one gest.

The "sleep" command on FreeBSD does not work has expected. All sleep time are multiplied by 3

Example :

 freebsdmachine ~ # time sleep 1
real	0m3.148s
user	0m0.000s
sys	0m0.002s

freebsdmachine ~ # time sleep 10
real	0m31.429s
user	0m0.009s
sys	0m0.002s

With the "-no-kvm" flag, the "sleep" command works has expected.

----------------------------------------------------------------------

Comment By: Ed Swierk (eswierk)
Date: 2009-07-24 07:01

Message:
Seems like there's a bug in one of the emulated timers. I worked around it
with the Fedora 11 version of kvm by using the -no-kvm-irqchip flag. 


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

[ kvm-Bugs-2826486 ] Clock speed in FreeBSD

[SourceForge.net]

Bugs item #2826486, was opened at 2009-07-24 11:16
Message generated for change (Tracker Item Submitted) made by polymorf34
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: POLYMORF34 (polymorf34)
Assigned to: Nobody/Anonymous (nobody)
Summary: Clock speed in FreeBSD

Initial Comment:
I use KVM 88 and KVM 85 on Gentoo GNU/Linux 2.6.29, running on Intel Core2 CPU 6320 and Intel Xeon CPU E5405, both in 64 bits mode.
All gests running on FreeBSD 7.1-p5 in 64 bits with -smp 1. The first machine host only one gest.

The "sleep" command on FreeBSD does not work has expected. All sleep time are multiplied by 3

Example :

 freebsdmachine ~ # time sleep 1
real	0m3.148s
user	0m0.000s
sys	0m0.002s

freebsdmachine ~ # time sleep 10
real	0m31.429s
user	0m0.009s
sys	0m0.002s

With the "-no-kvm" flag, the "sleep" command works has expected.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2826486&group_id=180599