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Re: [Xen-devel] [RFC][PATCH] 1/3] [XEN] Use explicit bit sized fields fo
| To: | George Dunlap <dunlapg@xxxxxxxxx>, Tony Breeds <tony@xxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [RFC][PATCH] 1/3] [XEN] Use explicit bit sized fields for exported xentrace data. |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Thu, 30 Nov 2006 17:03:26 +0000 |
| Cc: | Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 30 Nov 2006 09:03:35 -0800 |
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| Thread-topic: | [Xen-devel] [RFC][PATCH] 1/3] [XEN] Use explicit bit sized fields for exported xentrace data. |
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On 30/11/06 16:58, "George Dunlap" <dunlapg@xxxxxxxxx> wrote: > Hmm... this has the unfortunate side-effect of doubling the size of > the trace, and effectively halving the effectiveness of the trace > buffer in avoiding drops. My moderate-length traces are already in > the gigabyte range, and I occasionally lose trace records even with a > buffer size of 256. It would be really nice if we could avoid that. > > I happen to be using the VMENTER/VMEXIT tracing, which could be > consolidated into one record if we went to a 64-bit trace. Is anyone > else doing high-bandwidth tracing that this would affect in a > significantly negative way? As we move increasingly towards x86/64 this is an issue that will need to be addressed even if we leave the tracing fields as longs. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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