| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] iommu=1 by default? |
| From: | Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> |
| Date: | 2010年1月19日 09:59:16 +0000 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> |
| Delivery-date: | 2010年1月19日 02:00:47 -0800 |
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| Thread-topic: | iommu=1 by default? |
Would it make sense to make "iommu=1" the default for xen 4.0? I think Xen is rather more defensive these days about disabling iommu in the presence of broken BIOS tables, but there may conceivably still be machines it breaks boot on. I can't think of any subtle bugs the IOMMU could introduce if it's not explicitly in use by VMs -- and I don't believe anyone has seen any performance issues. [We could actually not fully turn the IOMMU on until the first VM that demands it.] Would it make sense to turn it on by default in the release candidates? Or too late? IOMMU is clearly going to be a widely used feature in this release. Ian _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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