The value of MAXPHYS is chosen to be 64K for the maximum raw I/O transfer size. I am wondering why it is not set larger. The maxcontig value of FFS is default to be 16, which means 16*8192 or 128K bytes (twice as big as 64K) . If we raise the value of MAXPHYS, we can put more data blocks of a big file contiguously on the disk (perhaps even more than 16 blocks to achieve better performance). Am I right? Is there any limit of the value of MAXPHYS?
Any help is appreciated. -Zhihui To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
