The Streamprocess.exe was consuming high CPU on the PVS servers. 
The Perfmon suggested sustained spike in Kernel mode and process dumps revealed that we were waiting for the Packet Send & Receive. 
 

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The issue was identified with the Anti-Virus that was blocking the network packets. The solution was to add the PVS related files to AV white list.
 

1. bndevice.exe: handles client functions, licensing, etc
2. bnistack6.sys:  IO protocol driver | UDP port 6911-6930
3. CVhdBusP6.sys: disk enumerator
4. CNicTeam.sys: network teaming if being used
5. CFsDep2.sys: system minifilter
6. CVhdMp.sys:  mtorage miniport driver

Avoid scanning, whitelist or permission the following processes on PVS Server 6.x\7.x:

1. Streamprocess.exe: IO delivery | UDP port 6901-6910
2. Streamservice.exe: watchdog for the streamprocess
3. Soapserver.exe: handles Database connectivity and AD authentication
4. Inventory.exe: vDisk Inventory | UDP port 6895
5. MgmtDaemon.exe: inter-server communication |UDP port 6898
6. Notifier.exe: inter-server communication | UDP port 6903
7. BNTFTP.exe: PVS TFTP delivers bootstrap | UDP port 69
8. PVSTSB.exe: Two Stage Boot delivers bootstrap | UDP port 6969
9. BNPXE.exe: PVS PXE service | Broadcast Protocol
10. BNAbsService.exe: PVS Ramdisk Server
11. CdfSvc.exe: Citrix Diagnostic Facility COM Server

WARNING! This article contains antivirus exclusions. It is important to understand that antivirus exclusions and optimizations increase the attack surface of a system and might expose computers to a variety of real security threats. However, the following guidelines typically represent the best tradeoff between security and performance. Citrix does not recommend implementing any of these exclusions or optimizations until rigorous testing has been conducted in a lab environment to thoroughly understand the tradeoffs between security and performance. Citrix also recommends organizations engage their antivirus and security teams to review the following guidelines before proceeding with any type of production deployment.
 

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Problem Cause

The Streamprocess.exe was consuming high CPU on all the PVS servers. 
The Perfmon suggested sustained spike in Kernel mode and process dumps revealed that we were waiting for the Packet Send & Receive. 
 

The Streamprocess.exe consumes high CPU on PVS Servers and we see a sustained CPU utilization.