Date: Fri, 27 Jul 2007 22:08:20 +0200 From: Fluffles <etc@fluffles.net> To: Dominic Bishop <dom@bishnet.net> Cc: geom@FreeBSD.org Subject: Re: Increasing GELI performance Message-ID: <46AA50B4.9080901@fluffles.net> In-Reply-To: <20070727195742.231CF13C461@mx1.freebsd.org> References: <20070727195742.231CF13C461@mx1.freebsd.org>
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Dominic Bishop wrote: > Another problem I've found is that if I use a sector size for GELI > 8192 > bytes then I'm unable to newfs the encrypted partition afterwards, it fails > immediately with this error: > > newfs /dev/da0p1.eli > increasing block size from 16384 to fragment size (65536) > /dev/da0p1.eli: 62499.9MB (127999872 sectors) block size 65536, fragment > size 65536 > using 5 cylinder groups of 14514.56MB, 232233 blks, 58112 inodes. > newfs: can't read old UFS1 superblock: read error from block device: Invalid > argument > > The underlying device is readable/writeable however as dd can read/write to > it without any errors. > Newfs will use 512-byte sectors by default so if you're using an 8KB sector size you need: newfs -S 8192 /dev/da0p1.eli To view the sector size you can also use diskinfo -v <device>. You can never write or read below the sector size (thats right, not even the filesystem can do that!) I can't help you with your GELI question. I'm assuming you run a quadcore 1.6GHz Xeon CPU? It should give you more performance than 50MB/s especially with 4 threads. On my Athlon 64 X2 3800+ (2x 2.0GHz 512KB) i got around 100 i believe. Do know that AMD processors perform relatively better in AES than Intel's line of CPUs, but with a quadcore i would have expected at least 160MB/s of thoughput. Maybe you should try geli on the raw device? Like: geli onetime da0 dd if=/dev/da0.eli of=/dev/null bs=1m count=1000 dd if=/dev/zero of=/dev/da0.eli bs=1m count=1000 It goes without saying that you should unmount and make sure no geom layer is using the da0 device. Good luck! - Veronica
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