Date: Thu, 06 Apr 2006 23:17:28 +1200 From: Mark Kirkwood <markir@paradise.net.nz> To: Eric <ericd@free.fr> Cc: Lucas Holt <luke@foolishgames.com>, freebsd-smp@freebsd.org Subject: Re: RESOLVED : Low perf with smp on DELL server Message-ID: <4434F8C8.8040004@paradise.net.nz> In-Reply-To: <002201c65963$e86e3990$65fd24c0@Eric> References: <009301c65418$cc029f30$65fd24c0@Eric> <64659004-E643-4044-AAED-076E0CC91977@foolishgames.com> <01a901c65493$77ad2740$65fd24c0@Eric> <442DC9B6.2090200@paradise.net.nz> <442EAA0A.8030704@he.iki.fi> <442F0E1B.9090505@paradise.net.nz> <027f01c657f4$0d0a66a0$65fd24c0@Eric> <4432858F.90701@he.iki.fi> <008001c65825$f3c27700$65fd24c0@Eric> <44331024.7090807@paradise.net.nz> <000a01c6588e$c3201da0$65fd24c0@Eric> <44339F80.3040704@paradise.net.nz> <002201c65963$e86e3990$65fd24c0@Eric>
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Eric wrote: > Hi Mark, > > I do a lot new test, re-install all system and arrive now to this : > Test without SMP : 29 sec > Test with SMP : 37 sec > Wich is very far from the 62 sec we have before with SMP and seems to be > "normal" for most people saying SMP and 4.11 are not so friend they > seems to be. Ok for you? > > It seems that problem before, came from perc4 controller configuration. > It seems that if you change configuration on fly you don't have the same > result ;=( as if you re-create the logical drive with good param and > put same param onfly . > Good configuration is for me disable any cache : > On creation and on configuration : Write Policy --> Writethru > Read Policy --> > non-adaptive > Don't know why difference was more important with SMP but it seems to > be now ok. > > As there is still few difference with SMP, I now do same test but > launching 1, 2, or 3 test in same time to see if it's usefulle for me to > have SMP kernel. Result is really near but I doubt that it's not > hardrive that slow down all system. > > Do you know a way to know the hard drive utilisation as with top? > (iostat always return 0) > Do you know a way to do high ramdrive? (I try with mount_mfs but it > always limit me to 400 Mo) > Well done - so you nailed it down to the controller! (chuckles - you might find 6.0 works better than 4.11 with SMP *now*).... With respect to the perc4 not showing up on iostat, could be that 4.11's support for this card is rudimentary - I would suggest starting a new thread asking about this! Cheers Mark
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