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Re: [Xen-devel] Root cause of the issue that HVM guest boots slowly with
| To: | "Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Root cause of the issue that HVM guest boots slowly with pvops dom0 |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 21 Jan 2010 08:44:33 +0000 |
| Cc: | |
| Delivery-date: | Thu, 21 Jan 2010 00:45:06 -0800 |
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| Thread-topic: | [Xen-devel] Root cause of the issue that HVM guest boots slowly with pvops dom0 |
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On 21/01/2010 08:16, "Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx> wrote: > - Limiting vCPU# of dom0 is always an easiest one - you may call it workaround > rather than a solution:) It not only reduces the total # of resched IPI ( = > mlock# * (vCPU#-1)), but reduces the cost of each handler - because of > spinlock. > But the impact is still there, more or less, when vCPU# > 1. > > - To remove mlock, another sharing method is needed between dom0 user space > app > and Xen HV. A pre-mlock()ed memory page for small (sub-page) hypercalls? Protected with a semaphore: failure to acquire semaphore means take slow path. Have all hypercallers in libxc launder their data buffers through a new interface that tries to grab and copy into the pre-allocated buffer. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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