It appears to be a problem with the kernel proper (ie., not a Red Hat patch). I
hit the soft lockup problem with kvm-48 and the 2.6.18.4 kernel which is the
base for RHEL5. That suggests a delivery between 2.6.18.4 (November 2006) and
2.6.23.1 fixed it.
david
Avi Kivity wrote:
> david ahern w
david ahern wrote:
> The issue appears to be with the RHEL5 kernel (host OS is rhel5). I tried
> your suggestions below -- no effect; still hit the softlockup.
>
> I then moved the host to the 2.6.23.1 kernel but with the kvm-48 code base.
> Surprisingly, I had no issues starting my guest with '-
The issue appears to be with the RHEL5 kernel (host OS is rhel5). I tried your
suggestions below -- no effect; still hit the softlockup.
I then moved the host to the 2.6.23.1 kernel but with the kvm-48 code base.
Surprisingly, I had no issues starting my guest with '-smp 4'.
david
Avi Kivity
I'll give your suggestions I try. I need to move to a server that I can
forcibly reboot remotely (to recover), so it will be a while.
david
Avi Kivity wrote:
> david ahern wrote:
>> As a quick test I added a printk to the loop, right after the while():
>>
>> while (atomic_read(&completed)
david ahern wrote:
> As a quick test I added a printk to the loop, right after the while():
>
> while (atomic_read(&completed) != needed) {
> printk("kvm_flush_remote_tlbs: completed = %d, needed = %d\n",
> atomic_read(&completed), needed);
> cpu_relax();
> barrier(
As a quick test I added a printk to the loop, right after the while():
while (atomic_read(&completed) != needed) {
printk("kvm_flush_remote_tlbs: completed = %d, needed = %d\n",
atomic_read(&completed), needed);
cpu_relax();
barrier();
}
This is the output r
david ahern wrote:
> I am trying, unsuccessfully so far, to get a vm running with 4 cpus. It is
> failing with a soft lockup:
>
> BUG: soft lockup detected on CPU#3!
> [] softlockup_tick+0x98/0xa6
> [] update_process_times+0x39/0x5c
> [] smp_apic_timer_interrupt+0x5c/0x64
> [] apic_timer_inter
I saw that in the latest git tree, but RHEL5 kernel does not have that
function. I guess I'll have to evaluate my options -- upgrading kernels, or
backporting code.
thanks,
david
Laurent Vivier wrote:
> david ahern a écrit :
>> I am trying, unsuccessfully so far, to get a vm running with 4 cp
david ahern a écrit :
> I am trying, unsuccessfully so far, to get a vm running with 4 cpus. It is
> failing with a soft lockup:
>
> BUG: soft lockup detected on CPU#3!
> [] softlockup_tick+0x98/0xa6
> [] update_process_times+0x39/0x5c
> [] smp_apic_timer_interrupt+0x5c/0x64
> [] apic_timer_i
