Date: Sat, 14 Feb 2004 01:44:24 +0000 From: Colin Percival <colin.percival@wadham.ox.ac.uk> To: Robert Watson <rwatson@freebsd.org> Cc: FreeBSD Hackers <FreeBSD-Hackers@freebsd.org> Subject: Re: malloc backed md/mfs filesystem swapped? Message-ID: <6.0.1.1.1.20040214014043.040c9d40@imap.sfu.ca> In-Reply-To: <Pine.NEB.3.96L.1040213195333.29948D-100000@fledge.watson.o rg> References: <20040213160451.GB13347@hal9000.halplant.com> <Pine.NEB.3.96L.1040213195333.29948D-100000@fledge.watson.org>
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At 00:56 14/02/2004, Robert Watson wrote: >If you >have swap available, you pretty much always want to use swap-backing for >memory disks -- if there's room in memory they will run as fast as >malloc-backed, but you don't have to be as worried about the "Oh shoot, >I'm out of room" case. Actually, there is one consideration: swap-backed memory disks have a sector size equal to the machine page size. This will result in some inflation in memory usage, and can confuse program which expect a sector size of 512 bytes (for example, dd, which I plan on fixing but I haven't gotten around to yet). Colin Percival
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