Date: Sat, 11 Dec 2004 15:54:19 +0100 From: "Daniel Eriksson" <daniel_k_eriksson@telia.com> To: "'Maxim Sobolev'" <sobomax@portaone.com>, <phk@freebsd.org> Cc: current@freebsd.org Subject: RE: GBDE write performance really sucks Message-ID: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAvoTmnUPKA062Kvn6usfa7AEAAAAA@telia.com> In-Reply-To: <41BB0305.7000206@portaone.com>
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Maxim Sobolev wrote: > I have noticed that GBDE write performance is very low, even > on modest > hardware (3.2 P4 with 1MB cache and 7200 IDE HDD): If you look through the freebsd-current archive you'll find a mail from me called "Simple BDE disc encryption benchmark" (2004-08-06). In that very simple benchmark I got quite different results on much slower hardware. I'll paste the entire mail below. As you can see from the benchmark, on old and slow hardware I managed to get ~4.5MB/s write performance (1.7GB written in 379 seconds). Could there be a problem with your test setup? ---[snip]--- Hi! I just ran a very simple benchmark on the GBDE disc encryption in CURRENT. The benchmark setup looked like this: * Slow machine (Celeron 366, 128MB mem) * 5-CURRENT from yesterday, running off of some old ATA disc * 2 x 9GB 10k rpm SCSI discs hooked up to an Adaptec 2940 The benchmark was to copy the /usr directory (copied from the ATA disc, 1.7GB) or a directory containing big files (/bigfiles, 1.7GB in 16 files created by 'dd if=/dev/random ...') from scsi disc 1 to scsi disc 2. I ran each benchmark twice and took a simple average of the results. unencrypted to unencrypted: /usr : 697 real 10.6 user 235 sys (~50% idle) /bigfiles: 123 real 0.4 user 84 sys (~25% idle) unencrypted to encrypted: /usr : 1778 real 10.7 user 236 sys (~35% idle) /bigfiles: 379 real 0.4 user 82 sys (~10% idle) encrypted to encrypted: /usr : 1978 real 11.6 user 242 sys (~25% idle) /bigfiles: 615 real 0.4 user 80 sys (0% idle) The only time the CPU was completely busy was when copying /bigfiles from encrypted to encrypted. ---[snip]--- /Daniel Eriksson
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