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| /freebsd-11-stable/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/ | ||
| H A D | spa.c | diff 345123 Thu Mar 14 01:03:20 MDT 2019 mav MFC r344903: Improve entropy for ZFS taskqueue selection. I just found that at least on Skylake CPUs cpu_ticks() never returns odd values, only even, and possibly has even bigger step (176/2?), that makes its lower bits very bad entropy source, leaving half of taskqueues unused. Switch to sbinuptime(), closer to upstreams, mitigates the problem by the rate conversion working as kind of hash function. In case that is somehow not enough (timer rate is too low or too divisible) mix in curcpu. |
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