<![CDATA[PFSense high CPU load on Hyper-V]]>Hey all,

Since the latest update I'm experiencing really high CPU load when moving data over the network. When copying files from a machine in the network or over the internet the download speed drops to around 2/3 MBs when this used to 9-10 over WAN and 30-40 over LAN.

It seems hv_event (hyper-v?) and clock are the problem but I don't know why this suddenly changed.
When this happens pfsense responds incredibly slow when using the shell and a command like vmstat takes around 30-60 seconds to complete.

When looking at the hyper-visor (Windows Server 2012 R2) nothing strange appears to be happening. The task manager tells me around 50-60 percent of the CPU is being used even though pfsense should be able to take 100%. Harddisk read/writes and the NIC usage is also really low (running 2 Samsung spinpoint f1's in raid 0 with 1gbit WAN and 1gbit lan).

PFSense is running on synthetic network adapters.

Any help would be appreciated.

System specs:

]]>https://forum.netgate.com/topic/76748/pfsense-high-cpu-load-on-hyper-vRSS for NodeSat, 10 Oct 2026 05:35:00 GMTTue, 09 Dec 2014 23:27:01 GMT60<![CDATA[Reply to PFSense high CPU load on Hyper-V on Wed, 10 Dec 2014 14:36:13 GMT]]>I moved my post: https://forum.pfsense.org/index.php?topic=85168.0

]]>https://forum.netgate.com/post/500426https://forum.netgate.com/post/500426Wed, 10 Dec 2014 14:36:13 GMT<![CDATA[Reply to PFSense high CPU load on Hyper-V on Wed, 10 Dec 2014 14:29:27 GMT]]>i think you'd be better off, posting in the 2.2 section of the forum …. beta

]]>https://forum.netgate.com/post/500425https://forum.netgate.com/post/500425Wed, 10 Dec 2014 14:29:27 GMT