FreeBSD 10.1 での ZFS の uma キャッシュが再有効化 ― 2014年10月30日 14時35分38秒
The vfs.zfs.zio.use_uma sysctl(8) has been re-enabled. On multi-CPU machines with enough RAM, this can easily double zfs(8) performance or reduce CPU usage in half. It was originally disabled due to memory and KVA exhaustion problem reports, which should be resolved due to several changes in the VM subsystem. [r260338]複数の CPU がありメモリに余裕のある機材では、zfs の性能があがり、CPU 利用率も下るとの事。
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