Source: linux Version: 3.16.39-1 Currently linux's kconfig in stable/testing/unstable sets CONFIG_NR_CPUS=32 on s390x. This is unhelpful when you have more cores than that assigned to a VM/LPAR. Reportedly all of SUSE, RedHat, and Ubuntu set it to 256 these days. Our amd64 config sets it to 512. I'd suggest bumping it at least to 256 in the Debian package. (This actually came up as a problem on the LINUX-360 mailing list.) Kind regards and thanks for considering the change Philipp Kern
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