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342357cd9e
Before this change ZFS created threads for 50% of CPUs for each top- level vdev. Plus it created the same number of threads for embedded log groups (that have only one metaslab and don't need any preload). As result, on system with 80 CPUs and pool of 60 vdevs this resulted in 4800 metaslab preload threads, that is absolutely insane. This patch changes the preload threads to 50% of CPUs in one taskq per pool, so on the mentioned system it will be only 40 threads. Among other things this fixes zdb on the mentioned system and pool on FreeBSD, that failed to create so many threads in one process. Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15319 |
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