Performance issue due to PCIE error

• Slowness reported by an application hosted on NetApp LUN/Volume.
• The latency is listed from the Network layer in the QOS statistics command output.

cluster::> qos statistics volume latency show -volume volume1 -vserver svm1
Workload        ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud 
----------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
volume1      17882     20.51ms    20.51ms      0ms        0ms        0ms        0ms        0ms        0ms  
volume1      17882     15.00ms    15.00ms      0ms        0ms        0ms        0ms        0ms        0ms  
volume1      17882     16.00ms    16.00ms      0ms        0ms        0ms        0ms        0ms        0ms 

• The RX/TX value of the FC port is well within the range.
• No error is noticed in the switch logs.
• The event log lists the PCIE error for one of the ports the host is logged into storage:

[Cluster1-01: PCI Link: pcie.stealth.link.errors:debug]: params: {'pcie_link_errors': 'performance is not optimal for PLX PCIE 8732 switch in slot 1 on Controller. Br[8732](4,0,0) in slot 1: LinkCap(MaxLkSp(3),MaxLkWd(16),ASPM(2),L0(6),L1(2),SurpDn,DLAct,Port(4)), LinkCap(MaxLkSp(3),MaxLkWd(16),ASPM(2),L0(6),L1(2),Port(0)), LinkStatus(LkSp(3),LkWd(2),DLAct).