Date: Sun, 24 Mar 2013 10:11:41 -0400 From: Bill Totman <bill.totman@gmail.com> To: davide.damico@contactlab.com Cc: freebsd-performance@freebsd.org Subject: Re: FreeBSD 9.1 vs CentOS 6.3 Message-ID: <514F099D.9040005@gmail.com> In-Reply-To: <5d10e2a0b0f6477293459a26df1fc272@sys.tomatointeractive.it> References: <CAF3xD3nDDUYB94TS9AUUQ=CPztB1S8mU4fRwNB5GupmK8MgwXg@mail.gmail.com> <ebfc033f-d8db-4162-86be-db013e3d7eb2@email.android.com> <1363998883.22604.YahooMailNeo@web141401.mail.bf1.yahoo.com> <5d10e2a0b0f6477293459a26df1fc272@sys.tomatointeractive.it>
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On 3/23/13 3:44 AM, Davide D'Amico wrote: > Il 23.03.2013 01:34 Paul Pathiakis ha scritto: >> Hi, >> >> There are several things about this that are highly suspect. >> >> First, wipe out the hardware RAID. The processor doing RAID >> computation is, probably, MUCH slower than a core on the CPU. Even if >> it's RAID-1 (Simple Mirror) this RAID card is performing tasks that is >> does not need to do including replicating writes to two targets from >> the controller or checking it's cache, battery, etc. If it's possible >> to disable the onboard cache, do it. > > Hi Paul, > thanks for your suggestions (some of them I've applied before starting > any consideration, like disabling all on-disk caches or controller > buffers) I'll try next monday. > > Anyway, the fact is that using the same hardware configuration > (raid1+raid10) I saw that a centos 6.x outperformed freebsd 9.1. > Another test I made yesterday was: on the same hardware I installed > vmware esx 5.x and created a vm with centos inside it. The result was > really impressive: the centos vm outperformed the 'real' freebsd 9.1 > too and checking vmware performances graphs I didn't see any huge need > for a massive throughput (I saw values from KBps to 10MBps), instead I > saw a big use of CPU (using OLTP tests with a concurrency of 32 > threads it's performaces began to slow down). > So, what happened when you installed FreeBSD 9.1 in the VM? How did the 'fake' FreeBSD 9.1 compare 1) to the 'real', and 2) to either of the CentOS installations? -bt > I don't know is using some magic value for HZ or setting some trick > with scheduler, I could gain something: I hope so, because I don't > want to "pinguinate" my farm :) > > Thanks, > d. > > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to > "freebsd-performance-unsubscribe@freebsd.org"
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