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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH RFC 2/4] xen-blkfront: improve aproximation of required grants per request
On 11/07/13 15:20, David Vrabel wrote: > On 08/07/13 14:03, Roger Pau Monne wrote: >> Improve the calculation of required grants to process a request by >> using nr_phys_segments instead of always assuming a request is going >> to use all posible segments. > > This isn't obviously correct to me. Why is this correct value for the > number of pages that need to be granted? This contains the number of scatter-gather DMA addr+len pairs, which is basically what we put at every granted page. for_each_sg iterates over the DMA addr+len pairs and uses a grant page for each of them. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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