Recommended values for TCP/IP stack memory parameters using ESX NFS datastore

Q: What is Tcpipheapsize

A:tcpipheapsize refers to the amount of memory allocated to the Vmkernel TCP/IP stack, ESX4 default is 16MB and the maximum is 32MB. NetApp recommends modification to 30MB

Tcpipheapmax refers to the Vmkernel TCP/IP stack memory can grow to the upper limit of the value, ESX4 default is 64MB, the maximum value is 128MB. NetApp recommends modification to 120MB

If you use NFS as a datastore storage protocol, it is recommended that you modify the above 2 values.

Otherwise, you may soon see a similar alert:

Heap:1856:tcpip:heap below 9%--2965344 bytes Free "

Or

Net:2684:size = 17034 too large for slab allocator using heap

Q: How to modify?

A: Select the host→configuration→advanced settings→ to the left of the net, pull the right down to the middle of the position, you can find these 2 parameters. You will need to restart the host to take effect after the modifications are completed.

If you use the command line, you can use the following command:

# esxcfg-advcfg-s 30/net/tcpipheapsize

# esxcfg-advcfg-s 120/net/tcpipheapmax

This article is from the "Delxu Live notepad" blog, please be sure to keep this source http://delxu.blog.51cto.com/975660/307054