Date: Fri, 22 Feb 2008 20:09:10 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Noisex <noisex@apollo.lv> Cc: freebsd-performance@freebsd.org Subject: Re: performance degradation in 6.2 when adding a second quad core chip Message-ID: <47BF1DD6.90607@FreeBSD.org> In-Reply-To: <00d201c8756b$44f3d4c0$cedb7e40$@lv> References: <C884D1B7-6D00-4D50-A1D5-FA04F533F757@safarivideonetworks.com> <47BE0016.6020407@FreeBSD.org> <2E9A88C1-067C-4C9C-A062-42203F47BF1C@safarivideonetworks.com> <00d201c8756b$44f3d4c0$cedb7e40$@lv>
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Noisex wrote: > So Benjamin you want to tell, that adding additional CPU decrease the > performance on 6.2? How did you made tests? > I just want to know because in my plans to the next week is also add > 2nd CPU (dual core) and some additional RAM to one of the my HP Proliant > DL360 (generaly mysql db server) because due to heavy MySQL usage nearly to > 100% or even more sometimes some of my customers are not very happy with > service like that (long load time). > > Server: HP proliant G4P DL360, CPU 1x3Ghz dual core, RAM: 4Gb (on system i > can see 3Gb :) ), SCSI 146Gbx2 (RAID 1+0 with smartarray controller p4600). > OS: FreeBSD 6.2, SMP I wouldn't bother with 8 CPUs if you are running 6.x. As I mentioned, 7.0 SMP performance is much better. http://people.freebsd.org/~kris/scaling/7.0%20Preview.pdf > p.s what you guys could recommend about enabled/disabled hyperthreading on > intel? Will it increase performance or over the left decrease? It depends on your workload, it may or may not give a performance benefit. ULE tends to perform better than 4BSD though. Kris
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