optmem_max

Maximum ancillary buffer size allowed per socket. Ancillary data is a sequence of struct cmsghdr structures with appended data. The default size is 10240 bytes.

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This appears to have changed

This appears to have changed to 20480. (On both an up to date version of gentoo and CentOS)

That looks like a Gentoo or

That looks like a Gentoo or Centos specific modification. I just checked, and the latest Linus kernel (that would be 2.6.36 currently) still has 10240 as a default value. OS is Debian sid.