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CONTAP-661767: ONTAP may experience memory pressure on low-memory systems due to excessive mbuf allocation

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ontap-9
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CORE
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Issue

On low-memory ONTAP systems, incorrect calculations for the nmbufs and nmbclusters limits could allow network buffer allocations to consume excessive FreeBSD memory. In severe cases, the resulting memory pressure could cause the node watchdog to panic and make data temporarily unavailable.

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