Date: Thu, 29 Mar 2007 17:52:40 +0200 From: Ivan Voras <ivoras@fer.hr> To: freebsd-geom@freebsd.org Subject: Re: raid3 is slow Message-ID: <eugncf$93l$1@sea.gmane.org> In-Reply-To: <86odmc42mh.fsf@dwp.des.no> References: <003401c7712a$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>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigA8F5CA0ABA6B1DA375705187 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Dag-Erling Sm=C3=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=20 they should - especially the g_down thread. In this case, load avg ( as=20 an approximation of real system load) is useful, and he's not concerned=20 without cause. --------------enigA8F5CA0ABA6B1DA375705187 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFGC+DPldnAQVacBcgRAvxgAKDZGc66iiLpsjuTVmBGWaWllwf8lgCg0J2Z o/1l9Lm/s5HfOSATilgR+mc= =tXRE -----END PGP SIGNATURE----- --------------enigA8F5CA0ABA6B1DA375705187--
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