Messages in this thread |  | | Date | Fri, 16 Feb 2007 10:49:10 +0000 | Subject | Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options. | From | Keir Fraser <> |
| |
On 16/2/07 08:37, "Dan Hecht" <dhecht@vmware.com> wrote:
> Hmm? I thought the periodic timer and one-shot timer both generate the > same VIRQ. So, how can you mask one without masking the other? > > The tickless idle works since the block hypercall disables the periodic > timer. But for dynticks (aka NO_HZ), you'll need to mask the periodic > timer (even for a running vcpu), while keeping the one-shot timer > unmasked. I don't think Xen provides an interface to do that.
There's no interface for this right now, but we can easily add one in a backward compatible way. This also will not prevent a dyntick kernel from running on an older Xen -- the guest will then receive to many timer interrupts, but that should only be a performance concern fixable by upgrading the hypervisor component of the system.
-- Keir
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |