On Sat, 14 Feb 2004, Colin Percival wrote: > 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).
One such application is Vinum, actually, which does not like using swap-backed storage nodes, although maybe I fixed that. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects [EMAIL PROTECTED] Senior Research Scientist, McAfee Research _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
