Date: Thu, 29 Mar 2007 18:18:07 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Eric Anderson <anderson@freebsd.org> Cc: Ivan Voras <ivoras@fer.hr>, freebsd-geom@freebsd.org Subject: Re: raid3 is slow Message-ID: <20070329161807.GB3325@garage.freebsd.pl> In-Reply-To: <460BE21E.7070700@freebsd.org> References: <003401c7712a$f71ebb60$6502a8c0@peteruj> <eudlg8$pm4$1@sea.gmane.org> <005c01c77134$28e0fce0$6502a8c0@peteruj> <86zm5xph7o.fsf@dwp.des.no> <005301c771e4$bb0a3900$6502a8c0@peteruj> <86lkhg5oz5.fsf@dwp.des.no> <007c01c771fe$805b2fc0$6502a8c0@peteruj> <86odmc42mh.fsf@dwp.des.no> <eugncf$93l$1@sea.gmane.org> <460BE21E.7070700@freebsd.org>
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--hHWLQfXTYDoKhP50 Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Mar 29, 2007 at 10:58:22AM -0500, Eric Anderson wrote: > On 03/29/07 10:52, Ivan Voras wrote: > >Dag-Erling Sm?=B8rgrav wrote: > >>You don't seem to understand what the load averages mean. They are > >>the average number of runnable threads in the scheduler queue over the > >>last one, five and fifteen seconds. Certain workloads will drive up > >>the load averages without consuming all available CPU time. This is > >>particularly the case for workloads where small chunks of data (e.g. > >>RAID3 stripes) are passed around between multiple threads. > >But, in his case the threads DO seem to consume much more CPU time than = they should - especially the g_down thread. In this case, load avg ( as an = approximation of real=20 > >system load) is useful, and he's not concerned without cause. >=20 >=20 > It would be good to see output of a ps -auxl next time he's running the t= est. Maybe I missed it, but I think we should start from asking about CPU he uses:) Full dmesg would be best. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --hHWLQfXTYDoKhP50 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFGC+a/ForvXbEpPzQRArH9AKDdbz9+hbDpbQgi+WBJJiHmi/mjJwCg05eS BaNOgfF7v/hUTqzRYgHsLl8= =awLv -----END PGP SIGNATURE----- --hHWLQfXTYDoKhP50--
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