Date: Thu, 3 Jun 1999 10:40:10 -0400 (EDT) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: freebsd-hackers@freebsd.org Subject: The choice of MAXPHYS Message-ID: <Pine.GSO.3.96.990603101914.28480A-100000@sol.cs.binghamton.edu>
next in thread | raw e-mail | index | archive | help
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 majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.GSO.3.96.990603101914.28480A-100000>