* Dom0 Hang for large VCPU counts > PCPU
@ 2007-01-24 18:56 Zulauf, John
2007-01-24 19:10 ` Keir Fraser
2007-01-24 19:34 ` Woller, Thomas
0 siblings, 2 replies; 9+ messages in thread
From: Zulauf, John @ 2007-01-24 18:56 UTC (permalink / raw)
To: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 580 bytes --]
We have been experimenting with large VCPU counts >> PCPU and have
succeeded in hanging Dom0 in or during /sbin/loader.
Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a Core2 Duo
(i.e. 2 PCPU) on a 965 chipset
VCPU=17 - works
VCPU=20 - works (takes a very long time)
VCPU=24 - lockup (whole machine, yes I mean Dom0)
VCPU=31 - same
VCPU=32 - same
We've noted in the Xen l-apic code a hard 32 CPU limit (a uint32 used as
an l-apic (vcpu?) bitmask), but this looks to be unrelated.
John Zulauf
Intel Corporation
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 18:56 Dom0 Hang for large VCPU counts > PCPU Zulauf, John
@ 2007-01-24 19:10 ` Keir Fraser
2007-01-24 19:28 ` Zulauf, John
2007-01-24 19:34 ` Woller, Thomas
1 sibling, 1 reply; 9+ messages in thread
From: Keir Fraser @ 2007-01-24 19:10 UTC (permalink / raw)
To: Zulauf, John, xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 431 bytes --]
On 24/1/07 6:56 pm, "Zulauf, John" <john.zulauf@intel.com> wrote:
> Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a Core2 Duo (i.e. 2
> PCPU) on a 965 chipset
>
> VCPU=17 works
> VCPU=20 works (takes a very long time)
> VCPU=24 lockup (whole machine, yes I mean Dom0)
> VCPU=31 same
> VCPU=32 same
Have you worked out where it gets stuck? Do many-VCPU domU guests fare
better?
-- Keir
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 19:10 ` Keir Fraser
@ 2007-01-24 19:28 ` Zulauf, John
2007-01-24 19:44 ` Keir Fraser
2007-01-24 19:49 ` Steven Hand
0 siblings, 2 replies; 9+ messages in thread
From: Zulauf, John @ 2007-01-24 19:28 UTC (permalink / raw)
To: Keir Fraser, xen-devel
________________________________________
On January 24, 2007 11:11 AM Keir Fraser [mailto:Keir.Fraser@cl.cam.ac.uk] wrote
> On 24/1/07 6:56 pm, "Zulauf, John" <john.zulauf@intel.com> wrote:
>
> > Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a Core2 Duo (i.e. 2 PCPU) on a 965 chipset
> >
> > VCPU=17 - works
> > VCPU=20 - works (takes a very long time)
> > VCPU=24 - lockup (whole machine, yes I mean Dom0)
> > VCPU=31 - same
> > VCPU=32 - same
>
> Have you worked out where it gets stuck? Do many-VCPU domU guests fare better?
It IS dying for a domU guests. Do you perhaps mean PV guests? No we haven't tried them. I don't have any at the moment to test.
Clarifying the initial report:
Host is 2 core (Core 2 Duo/965 chipset) box with VPCU=PCPU for Dom0.
Issue occurs when attempting to start an HVM DomU with VCPU >= 24 (though we haven't checked 21-23 yet).
The DomU never(apparently) starts, and Dom0 hard hangs. (i.e. not even the numlock key works)
Given that Dom0 hangs hard when this occurs, we don't have any ideas as to the exact cause of death.
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 18:56 Dom0 Hang for large VCPU counts > PCPU Zulauf, John
2007-01-24 19:10 ` Keir Fraser
@ 2007-01-24 19:34 ` Woller, Thomas
2007-01-26 0:42 ` Zulauf, John
1 sibling, 1 reply; 9+ messages in thread
From: Woller, Thomas @ 2007-01-24 19:34 UTC (permalink / raw)
To: Zulauf, John, xen-devel
Not sure if this is useful. We have a box with 8 cores, and can run 32
VCPUs without issue on AMD-V with suse10 64b smp guest.
This data though is from around january 8th, so it's a bit stale. I
don't have the exact c/s that the tests were run on, or the guest config
parms, but I think it was with 6Gig of RAM for the guest. :P I can try
this guest again next day or 2 if useful.
tom
XEND_DEBUG = 1
Name ID VCPU CPU State Time(s) CPU
Affinity
Domain-0 0 0 0 -b- 172.5 any cpu
Domain-0 0 1 1 -b- 60.0 any cpu
Domain-0 0 2 3 -b- 25.2 any cpu
Domain-0 0 3 3 r-- 10.2 any cpu
Domain-0 0 4 2 -b- 8.7 any cpu
Domain-0 0 5 5 -b- 6.8 any cpu
Domain-0 0 6 6 -b- 3.6 any cpu
Domain-0 0 7 0 -b- 4.8 any cpu
suse10_x64_smp 4 0 6 -b- 144.2 any cpu
suse10_x64_smp 4 1 4 -b- 36.3 any cpu
suse10_x64_smp 4 2 4 -b- 26.5 any cpu
suse10_x64_smp 4 3 3 --- 883.8 any cpu
suse10_x64_smp 4 4 5 r-- 885.6 any cpu
suse10_x64_smp 4 5 6 --- 883.6 any cpu
suse10_x64_smp 4 6 7 --- 884.2 any cpu
suse10_x64_smp 4 7 2 --- 884.4 any cpu
suse10_x64_smp 4 8 4 --- 886.8 any cpu
suse10_x64_smp 4 9 7 r-- 885.6 any cpu
suse10_x64_smp 4 10 6 --- 885.2 any cpu
suse10_x64_smp 4 11 4 r-- 884.0 any cpu
suse10_x64_smp 4 12 0 r-- 884.6 any cpu
suse10_x64_smp 4 13 3 --- 883.7 any cpu
suse10_x64_smp 4 14 1 --- 887.0 any cpu
suse10_x64_smp 4 15 1 --- 884.7 any cpu
suse10_x64_smp 4 16 0 --- 885.5 any cpu
suse10_x64_smp 4 17 7 --- 884.2 any cpu
suse10_x64_smp 4 18 2 r-- 885.9 any cpu
suse10_x64_smp 4 19 1 --- 886.0 any cpu
suse10_x64_smp 4 20 6 --- 885.7 any cpu
suse10_x64_smp 4 21 6 --- 886.4 any cpu
suse10_x64_smp 4 22 2 --- 885.6 any cpu
suse10_x64_smp 4 23 5 --- 888.9 any cpu
suse10_x64_smp 4 24 4 --- 885.0 any cpu
suse10_x64_smp 4 25 0 --- 885.2 any cpu
suse10_x64_smp 4 26 4 --- 885.0 any cpu
suse10_x64_smp 4 27 7 --- 885.1 any cpu
suse10_x64_smp 4 28 4 --- 882.4 any cpu
suse10_x64_smp 4 29 6 --- 884.1 any cpu
suse10_x64_smp 4 30 5 --- 883.6 any cpu
suse10_x64_smp 4 31 1 r-- 885.3 any cpu
________________________________
From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Zulauf, John
Sent: Wednesday, January 24, 2007 12:57 PM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
We have been experimenting with large VCPU counts >> PCPU and
have succeeded in hanging Dom0 in or during /sbin/loader.
Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a
Core2 Duo (i.e. 2 PCPU) on a 965 chipset
VCPU=17 - works
VCPU=20 - works (takes a very long time)
VCPU=24 - lockup (whole machine, yes I mean Dom0)
VCPU=31 - same
VCPU=32 - same
We've noted in the Xen l-apic code a hard 32 CPU limit (a uint32
used as an l-apic (vcpu?) bitmask), but this looks to be unrelated.
John Zulauf
Intel Corporation
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 19:28 ` Zulauf, John
@ 2007-01-24 19:44 ` Keir Fraser
2007-01-24 19:49 ` Steven Hand
1 sibling, 0 replies; 9+ messages in thread
From: Keir Fraser @ 2007-01-24 19:44 UTC (permalink / raw)
To: Zulauf, John, xen-devel
On 24/1/07 7:28 pm, "Zulauf, John" <john.zulauf@intel.com> wrote:
> Clarifying the initial report:
>
> Host is 2 core (Core 2 Duo/965 chipset) box with VPCU=PCPU for Dom0.
> Issue occurs when attempting to start an HVM DomU with VCPU >= 24 (though we
> haven't checked 21-23 yet).
> The DomU never(apparently) starts, and Dom0 hard hangs. (i.e. not even the
> numlock key works)
>
> Given that Dom0 hangs hard when this occurs, we don't have any ideas as to the
> exact cause of death.
Sorry, I misread the initial report.
So the HVM guest doesn't get as far as running hvmloader as far as you know?
Do the Xen debug keys work? (requires you to have a serial line connected)
-- Keir
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 19:28 ` Zulauf, John
2007-01-24 19:44 ` Keir Fraser
@ 2007-01-24 19:49 ` Steven Hand
2007-01-24 22:04 ` Zulauf, John
1 sibling, 1 reply; 9+ messages in thread
From: Steven Hand @ 2007-01-24 19:49 UTC (permalink / raw)
To: Zulauf, John, Keir Fraser, xen-devel
With FC6 (or any 2.6.18 kernel) there's an issue using the tsc clocksource
(we're working
on a fix); may not be related but could be worth booting with
"clocksource=acpi_pm".
cheers,
S.
----- Original Message -----
From: "Zulauf, John" <john.zulauf@intel.com>
To: "Keir Fraser" <Keir.Fraser@cl.cam.ac.uk>;
<xen-devel@lists.xensource.com>
Sent: Wednesday, January 24, 2007 7:28 PM
Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
________________________________________
On January 24, 2007 11:11 AM Keir Fraser [mailto:Keir.Fraser@cl.cam.ac.uk]
wrote
> On 24/1/07 6:56 pm, "Zulauf, John" <john.zulauf@intel.com> wrote:
>
> > Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a Core2 Duo
> > (i.e. 2 PCPU) on a 965 chipset
> >
> > VCPU=17 - works
> > VCPU=20 - works (takes a very long time)
> > VCPU=24 - lockup (whole machine, yes I mean Dom0)
> > VCPU=31 - same
> > VCPU=32 - same
>
> Have you worked out where it gets stuck? Do many-VCPU domU guests fare
> better?
It IS dying for a domU guests. Do you perhaps mean PV guests? No we
haven't tried them. I don't have any at the moment to test.
Clarifying the initial report:
Host is 2 core (Core 2 Duo/965 chipset) box with VPCU=PCPU for Dom0.
Issue occurs when attempting to start an HVM DomU with VCPU >= 24 (though we
haven't checked 21-23 yet).
The DomU never(apparently) starts, and Dom0 hard hangs. (i.e. not even the
numlock key works)
Given that Dom0 hangs hard when this occurs, we don't have any ideas as to
the exact cause of death.
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 19:49 ` Steven Hand
@ 2007-01-24 22:04 ` Zulauf, John
0 siblings, 0 replies; 9+ messages in thread
From: Zulauf, John @ 2007-01-24 22:04 UTC (permalink / raw)
To: Steven Hand, Keir Fraser, xen-devel
Thanks. I don't believe we're even getting through to the boot loader,
let alone to the kernel.
-----Original Message-----
From: Steven M. Hand [mailto:smh22@hermes.cam.ac.uk] On Behalf Of Steven
Hand
Sent: Wednesday, January 24, 2007 11:50 AM
To: Zulauf, John; Keir Fraser; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
With FC6 (or any 2.6.18 kernel) there's an issue using the tsc
clocksource
(we're working
on a fix); may not be related but could be worth booting with
"clocksource=acpi_pm".
cheers,
S.
----- Original Message -----
From: "Zulauf, John" <john.zulauf@intel.com>
To: "Keir Fraser" <Keir.Fraser@cl.cam.ac.uk>;
<xen-devel@lists.xensource.com>
Sent: Wednesday, January 24, 2007 7:28 PM
Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
________________________________________
On January 24, 2007 11:11 AM Keir Fraser
[mailto:Keir.Fraser@cl.cam.ac.uk]
wrote
> On 24/1/07 6:56 pm, "Zulauf, John" <john.zulauf@intel.com> wrote:
>
> > Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a Core2
Duo
> > (i.e. 2 PCPU) on a 965 chipset
> >
> > VCPU=17 - works
> > VCPU=20 - works (takes a very long time)
> > VCPU=24 - lockup (whole machine, yes I mean Dom0)
> > VCPU=31 - same
> > VCPU=32 - same
>
> Have you worked out where it gets stuck? Do many-VCPU domU guests fare
> better?
It IS dying for a domU guests. Do you perhaps mean PV guests? No we
haven't tried them. I don't have any at the moment to test.
Clarifying the initial report:
Host is 2 core (Core 2 Duo/965 chipset) box with VPCU=PCPU for Dom0.
Issue occurs when attempting to start an HVM DomU with VCPU >= 24
(though we
haven't checked 21-23 yet).
The DomU never(apparently) starts, and Dom0 hard hangs. (i.e. not even
the
numlock key works)
Given that Dom0 hangs hard when this occurs, we don't have any ideas as
to
the exact cause of death.
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: Dom0 Hang for large VCPU counts > PCPU
2007-01-24 19:34 ` Woller, Thomas
@ 2007-01-26 0:42 ` Zulauf, John
2007-01-28 18:52 ` Woller, Thomas
0 siblings, 1 reply; 9+ messages in thread
From: Zulauf, John @ 2007-01-26 0:42 UTC (permalink / raw)
To: Woller, Thomas, xen-devel
Further testing:
A brief update the DomU "crash for large VCPU count"
For PCPU == 2 (single Core 2 Duo/965 platform) host machine hangs for
with VCPU's > 20.
For PCPU == 8 (Dual quadcore/Bensley)
we have tested up to 24 VCPU successfully. However, we've seen FC6
rebooting the DomU sporadically with VCPU > 16. The suggested
clock_source option has no effect.
-----Original Message-----
From: Woller, Thomas [mailto:thomas.woller@amd.com]
Sent: Wednesday, January 24, 2007 11:35 AM
To: Zulauf, John; xen-devel@lists.xensource.com
Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
Not sure if this is useful. We have a box with 8 cores, and can run 32
VCPUs without issue on AMD-V with suse10 64b smp guest.
This data though is from around january 8th, so it's a bit stale. I
don't have the exact c/s that the tests were run on, or the guest config
parms, but I think it was with 6Gig of RAM for the guest. :P I can try
this guest again next day or 2 if useful.
tom
XEND_DEBUG = 1
Name ID VCPU CPU State Time(s) CPU
Affinity
Domain-0 0 0 0 -b- 172.5 any cpu
Domain-0 0 1 1 -b- 60.0 any cpu
Domain-0 0 2 3 -b- 25.2 any cpu
Domain-0 0 3 3 r-- 10.2 any cpu
Domain-0 0 4 2 -b- 8.7 any cpu
Domain-0 0 5 5 -b- 6.8 any cpu
Domain-0 0 6 6 -b- 3.6 any cpu
Domain-0 0 7 0 -b- 4.8 any cpu
suse10_x64_smp 4 0 6 -b- 144.2 any cpu
suse10_x64_smp 4 1 4 -b- 36.3 any cpu
suse10_x64_smp 4 2 4 -b- 26.5 any cpu
suse10_x64_smp 4 3 3 --- 883.8 any cpu
suse10_x64_smp 4 4 5 r-- 885.6 any cpu
suse10_x64_smp 4 5 6 --- 883.6 any cpu
suse10_x64_smp 4 6 7 --- 884.2 any cpu
suse10_x64_smp 4 7 2 --- 884.4 any cpu
suse10_x64_smp 4 8 4 --- 886.8 any cpu
suse10_x64_smp 4 9 7 r-- 885.6 any cpu
suse10_x64_smp 4 10 6 --- 885.2 any cpu
suse10_x64_smp 4 11 4 r-- 884.0 any cpu
suse10_x64_smp 4 12 0 r-- 884.6 any cpu
suse10_x64_smp 4 13 3 --- 883.7 any cpu
suse10_x64_smp 4 14 1 --- 887.0 any cpu
suse10_x64_smp 4 15 1 --- 884.7 any cpu
suse10_x64_smp 4 16 0 --- 885.5 any cpu
suse10_x64_smp 4 17 7 --- 884.2 any cpu
suse10_x64_smp 4 18 2 r-- 885.9 any cpu
suse10_x64_smp 4 19 1 --- 886.0 any cpu
suse10_x64_smp 4 20 6 --- 885.7 any cpu
suse10_x64_smp 4 21 6 --- 886.4 any cpu
suse10_x64_smp 4 22 2 --- 885.6 any cpu
suse10_x64_smp 4 23 5 --- 888.9 any cpu
suse10_x64_smp 4 24 4 --- 885.0 any cpu
suse10_x64_smp 4 25 0 --- 885.2 any cpu
suse10_x64_smp 4 26 4 --- 885.0 any cpu
suse10_x64_smp 4 27 7 --- 885.1 any cpu
suse10_x64_smp 4 28 4 --- 882.4 any cpu
suse10_x64_smp 4 29 6 --- 884.1 any cpu
suse10_x64_smp 4 30 5 --- 883.6 any cpu
suse10_x64_smp 4 31 1 r-- 885.3 any cpu
________________________________
From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Zulauf, John
Sent: Wednesday, January 24, 2007 12:57 PM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
We have been experimenting with large VCPU counts >> PCPU and
have succeeded in hanging Dom0 in or during /sbin/loader.
Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a
Core2 Duo (i.e. 2 PCPU) on a 965 chipset
VCPU=17 - works
VCPU=20 - works (takes a very long time)
VCPU=24 - lockup (whole machine, yes I mean Dom0)
VCPU=31 - same
VCPU=32 - same
We've noted in the Xen l-apic code a hard 32 CPU limit (a uint32
used as an l-apic (vcpu?) bitmask), but this looks to be unrelated.
John Zulauf
Intel Corporation
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: Dom0 Hang for large VCPU counts > PCPU
2007-01-26 0:42 ` Zulauf, John
@ 2007-01-28 18:52 ` Woller, Thomas
0 siblings, 0 replies; 9+ messages in thread
From: Woller, Thomas @ 2007-01-28 18:52 UTC (permalink / raw)
To: Zulauf, John, xen-devel
More info. Using c/s 13628 64b smp hv, with SMP HVM suseLinux10 and
Opensuse10.2 64b guests, w/ gfx enabled.
Guest config parms: 32 VCPUS, 2000 memory, pae/acpi/apic=1,
shadow_memory=512, no vif line
Machine has 8 physical cores in AMD-V system, w/ 16G physical RAM.
SuseLinux10 (8 PCPU) = boots 32 VCPUs without issue w/ standard guest
kernel config
SuseLinux10 (2 PCPU maxcpus=2) = boots 32 VCPUs without issue (quite a
bit slower) w/ standard guest kernel config, guest very unresponsive,
and dom0 very slow response but better than guest. Vcpu-list shows that
all 32 VCPUs are running though. Unable to login to guest after 10
minutes, after entering login/passwd.
OpenSuse10.2 = hangs on boot with standard guest kernel boot options
adding acpi=off allows boot
adding clocksource=acpi_pm did not help, still hangs on boot
(black screen, no splash ever displayed)
I'll run some overnight tests on the 8 PCPU SUSE10 setup, and see if it
is stable wrt >16 VCPUs running.
tom
> -----Original Message-----
> From: Zulauf, John [mailto:john.zulauf@intel.com]
> Sent: Thursday, January 25, 2007 6:43 PM
> To: Woller, Thomas; xen-devel@lists.xensource.com
> Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
>
> Further testing:
>
> A brief update the DomU "crash for large VCPU count"
>
> For PCPU == 2 (single Core 2 Duo/965 platform) host machine
> hangs for with VCPU's > 20.
>
> For PCPU == 8 (Dual quadcore/Bensley)
>
> we have tested up to 24 VCPU successfully. However, we've
> seen FC6 rebooting the DomU sporadically with VCPU > 16. The
> suggested clock_source option has no effect.
>
>
> -----Original Message-----
> From: Woller, Thomas [mailto:thomas.woller@amd.com]
> Sent: Wednesday, January 24, 2007 11:35 AM
> To: Zulauf, John; xen-devel@lists.xensource.com
> Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
>
> Not sure if this is useful. We have a box with 8 cores, and
> can run 32 VCPUs without issue on AMD-V with suse10 64b smp guest.
> This data though is from around january 8th, so it's a bit
> stale. I don't have the exact c/s that the tests were run
> on, or the guest config parms, but I think it was with 6Gig
> of RAM for the guest. :P I can try this guest again next day
> or 2 if useful.
> tom
>
> XEND_DEBUG = 1
> Name ID VCPU CPU State Time(s) CPU
> Affinity
> Domain-0 0 0 0 -b-
> 172.5 any cpu
> Domain-0 0 1 1 -b-
> 60.0 any cpu
> Domain-0 0 2 3 -b-
> 25.2 any cpu
> Domain-0 0 3 3 r--
> 10.2 any cpu
> Domain-0 0 4 2 -b-
> 8.7 any cpu
> Domain-0 0 5 5 -b-
> 6.8 any cpu
> Domain-0 0 6 6 -b-
> 3.6 any cpu
> Domain-0 0 7 0 -b-
> 4.8 any cpu
> suse10_x64_smp 4 0 6 -b-
> 144.2 any cpu
> suse10_x64_smp 4 1 4 -b-
> 36.3 any cpu
> suse10_x64_smp 4 2 4 -b-
> 26.5 any cpu
> suse10_x64_smp 4 3 3 ---
> 883.8 any cpu
> suse10_x64_smp 4 4 5 r--
> 885.6 any cpu
> suse10_x64_smp 4 5 6 ---
> 883.6 any cpu
> suse10_x64_smp 4 6 7 ---
> 884.2 any cpu
> suse10_x64_smp 4 7 2 ---
> 884.4 any cpu
> suse10_x64_smp 4 8 4 ---
> 886.8 any cpu
> suse10_x64_smp 4 9 7 r--
> 885.6 any cpu
> suse10_x64_smp 4 10 6 ---
> 885.2 any cpu
> suse10_x64_smp 4 11 4 r--
> 884.0 any cpu
> suse10_x64_smp 4 12 0 r--
> 884.6 any cpu
> suse10_x64_smp 4 13 3 ---
> 883.7 any cpu
> suse10_x64_smp 4 14 1 ---
> 887.0 any cpu
> suse10_x64_smp 4 15 1 ---
> 884.7 any cpu
> suse10_x64_smp 4 16 0 ---
> 885.5 any cpu
> suse10_x64_smp 4 17 7 ---
> 884.2 any cpu
> suse10_x64_smp 4 18 2 r--
> 885.9 any cpu
> suse10_x64_smp 4 19 1 ---
> 886.0 any cpu
> suse10_x64_smp 4 20 6 ---
> 885.7 any cpu
> suse10_x64_smp 4 21 6 ---
> 886.4 any cpu
> suse10_x64_smp 4 22 2 ---
> 885.6 any cpu
> suse10_x64_smp 4 23 5 ---
> 888.9 any cpu
> suse10_x64_smp 4 24 4 ---
> 885.0 any cpu
> suse10_x64_smp 4 25 0 ---
> 885.2 any cpu
> suse10_x64_smp 4 26 4 ---
> 885.0 any cpu
> suse10_x64_smp 4 27 7 ---
> 885.1 any cpu
> suse10_x64_smp 4 28 4 ---
> 882.4 any cpu
> suse10_x64_smp 4 29 6 ---
> 884.1 any cpu
> suse10_x64_smp 4 30 5 ---
> 883.6 any cpu
> suse10_x64_smp 4 31 1 r--
> 885.3 any cpu
>
>
> ________________________________
>
> From: xen-devel-bounces@lists.xensource.com
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of
> Zulauf, John
> Sent: Wednesday, January 24, 2007 12:57 PM
> To: xen-devel@lists.xensource.com
> Subject: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
>
>
>
> We have been experimenting with large VCPU counts >>
> PCPU and have succeeded in hanging Dom0 in or during /sbin/loader.
>
>
>
> Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a
> Core2 Duo (i.e. 2 PCPU) on a 965 chipset
>
>
>
> VCPU=17 - works
>
> VCPU=20 - works (takes a very long time)
>
> VCPU=24 - lockup (whole machine, yes I mean Dom0)
>
> VCPU=31 - same
>
> VCPU=32 - same
>
>
>
> We've noted in the Xen l-apic code a hard 32 CPU limit
> (a uint32 used as an l-apic (vcpu?) bitmask), but this looks
> to be unrelated.
>
>
>
> John Zulauf
>
> Intel Corporation
>
>
>
>
>
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2007-01-28 18:52 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-01-24 18:56 Dom0 Hang for large VCPU counts > PCPU Zulauf, John
2007-01-24 19:10 ` Keir Fraser
2007-01-24 19:28 ` Zulauf, John
2007-01-24 19:44 ` Keir Fraser
2007-01-24 19:49 ` Steven Hand
2007-01-24 22:04 ` Zulauf, John
2007-01-24 19:34 ` Woller, Thomas
2007-01-26 0:42 ` Zulauf, John
2007-01-28 18:52 ` Woller, Thomas
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