Date: Sun, 29 Feb 2004 16:48:40 +0000 From: Colin Percival <colin.percival@wadham.ox.ac.uk> To: Colin Percival <cperciva@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/md md.c Message-ID: <6.0.1.1.1.20040229164027.040109e8@imap.sfu.ca> In-Reply-To: <200402291558.i1TFwsGw035149@repoman.freebsd.org> References: <200402291558.i1TFwsGw035149@repoman.freebsd.org>
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At 15:58 29/02/2004, Colin Percival wrote: > Modified files: > sys/dev/md md.c > Log: > Use DEV_BSIZE byte sectors instead of PAGE_SIZE byte sectors for > swap-backed memory disks. This reduces filesystem allocation overhead > and makes swap-backed memory disks compatible with broken code (dd, > for example) which expects to see 512 byte sectors. The size of a > swap-backed memory disk must still be a multiple of the page size. I should probably add here that anyone who regularly uses filesystems on swap-backed memory disks might like to revisit them and examine the sizes and inode densities they're using. Existing filesystem images will work fine, since ufs keeps track of the sector size it is using, but creating a new filesystem and dumping everything across will save space (and thus memory and time). Colin Percival
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