Date: Tue, 2 Oct 2001 23:57:58 -0600 From: "Jamie Hermans" <freebsd@hermans.ca> To: <freebsd-stable@FreeBSD.ORG> Cc: "'Pete French'" <pfrench@firstcallgroup.co.uk> Subject: RE: dirpref speedup with Compaq RAID controller Message-ID: <000101c14bd0$5a8b8ba0$641ca8c0@jhermansw2k> In-Reply-To: <E15oY4X-000LXM-00@mailhost.firstcallgroup.co.uk>
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> -----Original Message-----
> From: owner-freebsd-stable@FreeBSD.ORG
> Sent: Tuesday, October 2, 2001 4:31 pm
> To: freebsd-stable@FreeBSD.ORG
> Subject: dirpref speedup with Compaq RAID controller
>
> As someone requested timings from RAID systems for old/new
> dirpref code:
>
> System has as the main disc (i.e. boot, /, /usr etc) as pair
> of SCSI UW drives connected to a Compaq SMART-2SL controller.
> Configuration is RAID 0, and I think the stripe size is 64k
> or so - whatever the conttroller thinks is suitable for UNIX
> anyway. I recreated my /usr/src tree using tar/untar into a
> directory next to it so I could compare operations. The disc
> has softupdates enabled on it.
>
> Doing a 'du -s' is 2.1 times faster on the new tree.
> Doing an 'rm -r' is 2.9 times faster on the new tree.
>
> {snip}
>
> -pete.
>
Just to throw my results into the hat...
* CPU's Pentium/P54C (167.01-MHz 586-class CPU) (FreeBSD/SMP)
* Compaq SMART-2/P array controller, 3 x 4.3GB SCSI drives in RAID 0
* /dev/idad0s1e on /usr (ufs, local, soft-updates)
* Filesystem Size Used Avail Capacity Mounted on
/dev/idad0s1e 11G 951M 9.2G 9% /usr
shutdown now
umount /usr
dump ...
time rm -rf /usr/ports = 5m21s (before)
newfs -U /dev/idad0s1e
mount /usr && cd /usr
restore ...
time rm -rf /usr/ports = 1m29s (after)
-- Jamie
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