Date: Thu, 29 Mar 2007 14:42:32 +0200 From: Ivan Voras <ivoras@fer.hr> To: freebsd-geom@freebsd.org Subject: Re: raid3 is slow Message-ID: <eugc7p$kmh$1@sea.gmane.org> In-Reply-To: <007c01c771fe$805b2fc0$6502a8c0@peteruj> References: <003401c7712a$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>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig3681B5D0626F389387AA5E67 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Szab=C3=B3 P=C3=A9ter wrote: >>> After a few minutes > PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND > 4 root 1 -8 0 0K 8K - 42:47 53.27% g_down > 15400 root 1 -8 0 0K 8K - 82:18 19.38% g_bde=20 > raid3/nmivole > 11 root 1 171 52 0K 8K RUN 968:44 12.60% idle > 3 root 1 -8 0 0K 8K - 22:12 3.03% g_up > 19970 root 1 -16 0 3400K 1772K wdrain 1:12 2.93% dd > 40 root 1 -8 0 0K 8K r3:w1 36:18 1.07% g_raid3 = > nmivol > It seems terible!!! g_down gets more and more and more WCPU, and the=20 > load goes to the skies. I don't know, what should i think. Now i can=20 > see, at the end i will change the raid3 to stripe ;) But i don't want t= o :( Also one of the "shouldn't happen" things - g_down is (roughly) the=20 kernel thread that dispatches IO requests from the file system to the=20 lower level devices, gbde and graid3 in your case. It's strange that it=20 consumes that much CPU - it may mean that one of the GEOM classes is=20 being unusually slow in offloading requests to its own thread, or that=20 there's an unusual number of small requests bouncing between them. Try=20 running 'gstat' during this test and post some results. If you have the time, also try using geli instead of gbde, just to=20 experiment. --------------enig3681B5D0626F389387AA5E67 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 iD8DBQFGC7Q4ldnAQVacBcgRArf5AJ9IPeJ/9y5c1XyFEH4GSr2nzfPDlQCcDaM+ /aH0Btx3xWPBMFmsjFnAq5Y= =DivZ -----END PGP SIGNATURE----- --------------enig3681B5D0626F389387AA5E67--
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