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Running PV kernel on XenServer kills all VMs

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• To: port-xen%netbsd.org@localhost
• Subject: Running PV kernel on XenServer kills all VMs
• From: Stephen Borrill <netbsd%precedence.co.uk@localhost>
• Date: 2010年6月11日 17:38:33 +0100 (BST)

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I've finally worked out how to get NetBSD i386 and amd64 mostly running in full PV mode rather than HVM within Citrix XenServer. I say mostly running because the downside is that booting the VM kills networking for all other VMs and even stops them being able to shutdown cleanly leading to a forced reboot of the XenServer.

dmesg on the dom0 shows:
__ratelimit: 1431411 callbacks suppressed
xen_net: Memory squeeze in netback driver.
xen_net: Memory squeeze in netback driver.
xen_net: Memory squeeze in netback driver.

Google suggests that raising (or hardwiring) dom0_mem may help, but other guests don't appear to need this and it's already set to 752M.

Details on switching to PV from HVM can be found at:
http://www.precedence.co.uk/wiki/Support-KB-NetBSD/XenServer
XenServer is free from:
http://www.citrix.com/English/ps2/products/feature.asp?contentID=2300356
--
Stephen

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