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35 lines
1.4 KiB
Markdown
35 lines
1.4 KiB
Markdown
---
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title: WindowsNetworkDiscards
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---
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## Meaning
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The sum of inbound and outbound discarded packet rates exceeds the configured
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threshold for 15 minutes. The default is one discard per second per interface.
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Discards count packets dropped without a packet error, such as buffer exhaustion.
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## Impact
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Dropped packets can cause retransmissions, reduced throughput, and application
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timeouts. Some drops may be expected under a deliberate traffic policy.
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## Diagnosis
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1. Inspect `windows:net_received_discarded:rate` and
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`windows:net_outbound_discarded:rate` to identify the direction and affected
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`nic`.
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2. Compare traffic, directional utilization ratios, and
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`windows_net_output_queue_length_packets` with the normal baseline.
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3. Inspect `Get-NetAdapterStatistics`, switch-port drops, adapter buffers,
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virtual switch counters, and network QoS policies.
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4. Correlate drops with CPU pressure, traffic bursts, hypervisor contention, and
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application failures. An unknown or zero bandwidth estimate produces no
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utilization sample and should not be interpreted as zero traffic.
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## Mitigation
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Relieve congestion, distribute traffic, or add bandwidth. Correct buffer, driver,
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or virtual switch problems when evidence identifies them. Review intentional
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drop policies with the network owner before changing thresholds. Confirm discard
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rates and application retransmissions return to the expected baseline.
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