Date: Fri, 30 Jan 2009 21:50:55 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-geom@freebsd.org Subject: Re: Performance numbers? Message-ID: <glvp7l$6td$3@ger.gmane.org> In-Reply-To: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org> References: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig972A8BB3359AF9247701B7E9 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Eric Anderson wrote: > Hi GEOMers! >=20 > Does anyone have any benchmarks or numbers relating to GEOM performance= ? >=20 > I tried doing some on my own, but I didn't get very satisfactory > results, so I'm curious what others have seen or used. >=20 > My hardware is a Core 2 Quad, with 4GB of ram. >=20 > First, I made an mdconfig'ed malloc backed 'disk' of 1.5GB. Then, I > tried running such tools as rawio, and diskinfo. rawio fails with > input/output errors, and diskinfo wants a larger device to give the ful= l > stats. I ended up using purely dd since that worked. Interestingly > enough, dd'ing to the malloc device results in about 1000 operations pe= r > second, regardless of a blocksize of 512bytes or 1MB. It's a good idea for testing. 1000 ops/s looks suspiciously like HZ, though I don't know why HZ would influence GEOM (AFAIK context switches between threads, including GEOM threads do not depend on it) - can you try ruling out HZ? --------------enig972A8BB3359AF9247701B7E9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJg2gwldnAQVacBcgRAtZAAKDrj3n18jLfzRkBkNs/Cqk8JoiZPQCfVmXJ MaqV5d+9n7UKOs62jJ+mx30= =Ym8U -----END PGP SIGNATURE----- --------------enig972A8BB3359AF9247701B7E9--
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