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Date:      Mon, 13 Jan 2020 13:32:22 +0100 (CET)
From:      Wojciech Puchar <wojtek@puchar.net>
To:        freebsd-hackers@freebsd.org
Subject:   tested setting of MAXPHYS/BKVASIZE
Message-ID:  <alpine.BSF.2.20.2001131330360.47879@puchar.net>

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for whose who use HDDs put in kernel config setting below.

makeoptions     CONF_CFLAGS="-DBKVASIZE=32768"
options         MAXPHYS=4194304


or RAID5 arrays with large stripe size higher value of MAXPHYS would make 
sense.

additionally bump vfs.hirunningspace and vfs.lorunningspace (in 
/boot/loader.conf or sysctl.conf)

i have

vfs.hirunningspace=50000000
vfs.lorunningspace=35000000


it should be at least few times MAXPHYS



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