The Crucial Blog
August 17, 2008
Xen Bug: xen_net: Memory squeeze in netback driver (32bit PAE)
If you are receiving the following error in your logs while running a 32bit PAE Xen Kernel:
xen_net: Memory squeeze in netback driver
Then you need to do the following:
1. In your grub.conf (or other bootloader) set the Dom0 to a fixed size: dom0_mem=1024.
2. In /etc/xen/xend-config.sxp set dom0-min-mem to the same size as above.
3. Reboot
Basically what you are doing is ensuring that Dom0 will not be decreased in size, as when this happens it causes problems the the xen_net driver which can in turn cause network connectivity problems with your DomUs.
Tags: hypervm, server-administration, vds, xenFiled under: Uncategorized by — aaron @ 10:10 pm
4 Responses to “Xen Bug: xen_net: Memory squeeze in netback driver (32bit PAE)”
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is this problem causing the host node (dom0) became hang/freeze?
Yes, I believe it can cause dom0 to hang. We had a number of issues with the xen_net driver. By doing the above it helped keep our 32bit PAE servers much more stable!
i also have another problem that the domU got segmentation fault every time i want to compile apache + php 5 using easyapache. is it possible that it’s caused by this problem too?
Hi FH, we have not had problems like this due to the 32bit PAE kernel, however this is not to say it will not cause those sorts of problems.