calibre做PEX提示下面的warning,请问怎么处理？

jinyl123

Please increase descriptors limit for best performance (4096)
Please increase descriptors limit for best performance (4096)
Layer "mos_gate" is not mapped to a calibrated layer.
Layer "ntap_all" is not mapped to a calibrated layer.
Layer "pwc_sub" is not mapped to a calibrated layer.
Please increase descriptors limit for best performance (4096)