Date: Mon, 4 Aug 2003 14:48:54 -0400 From: Jung-uk Kim <jkim@niksun.com> To: freebsd-arch@freebsd.org Subject: Confusing BKVASIZE Message-ID: <200308041448.54790.jkim@niksun.com>
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As you know, BKVASIZE is 16K: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/sys/param.h#rev1.63 Default UFS block size is also 16K: http://www.freebsd.org/cgi/cvsweb.cgi/src/sbin/newfs/newfs.c#rev1.46 But src/sys/sys/param.h says: 'The default (BKVASIZE) is 16384, roughly 2x the block size used by a normal UFS filesystem.' This is not true any more and it is really confusing. In fact, I found many confusing instances, e.g. src/sys/kern/vfs_bio.c: /* * To support extreme low-memory systems, make sure hidirtybuffers cannot * eat up all available buffer space. This occurs when our minimum cannot * be met. We try to size hidirtybuffers to 3/4 our buffer space assuming * BKVASIZE'd (8K) buffers. */ I cannot believe comments any more and this is clearly error-prone. :-( Can anybody clean this mess up? Thanks, Jung-uk Kim
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