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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 11:23:06 +0000 |
| Cc: | |
| Delivery-date: | Thu, 21 Jan 2010 03:23:35 -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 09:27, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote: >> 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. > > I'll sort out a trial patch for this myself. How does the attached patch work for you? It ought to get you the same speedup as your hack. -- Keir
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