named-chroot.service 服务启动失败，默认分配系统90%内存，失败退出

环境：鲲鹏920 + 22.03SP1
named-chroot.service 服务启动失败

```
# systemctl start named-chroot
Job for named-chroot.service failed because the control process exited with error code.
See "systemctl status named-chroot.service" and "journalctl -xeu named-chroot.service" for details.

# # systemctl status named-chroot
× named-chroot.service - Berkeley Internet Name Domain (DNS)
     Loaded: loaded (/usr/lib/systemd/system/named-chroot.service; disabled; vendor preset: disabled)
     Active: failed (Result: exit-code) since Thu 2025-07-17 15:01:04 CST; 11s ago
    Process: 170131 ExecStartPre=/bin/bash -c if [ ! "$DISABLE_ZONE_CHECKING" == "yes" ]; then /usr/sbin/named-checkconf -t /var/named/chroot -z "$NAMEDCONF"; else echo "C>
    Process: 170134 ExecStart=/usr/sbin/named -u named -c ${NAMEDCONF} -t /var/named/chroot $OPTIONS (code=exited, status=1/FAILURE)

Jul 17 15:01:03 kunpeng920 named[170135]: using default UDP/IPv4 port range: [1024, 65535]
Jul 17 15:01:03 kunpeng920 named[170135]: using default UDP/IPv6 port range: [1024, 65535]
Jul 17 15:01:03 kunpeng920 named[170135]: listening on IPv4 interface lo, 127.0.0.1#53
Jul 17 15:01:03 kunpeng920 named[170135]: listening on IPv6 interface lo, ::1#53
Jul 17 15:01:03 kunpeng920 named[170135]: generating session key for dynamic DNS
Jul 17 15:01:03 kunpeng920 named[170135]: sizing zone task pool based on 6 zones
Jul 17 15:01:03 kunpeng920 named[170135]:  **none:87: 'max-cache-size 90%' - setting to 1856197MB (out of 2062441MB)** 
Jul 17 15:01:04 kunpeng920 systemd[1]: named-chroot.service: Control process exited, code=exited, status=1/FAILURE
Jul 17 15:01:04 kunpeng920systemd[1]: named-chroot.service: Failed with result 'exit-code'.
Jul 17 15:01:04 kunpeng920 systemd[1]: Failed to start Berkeley Internet Name Domain (DNS).
```

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