Date: Mon, 4 Jun 2007 18:30:21 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Chris <chrcoluk@gmail.com> Cc: Tim Daneliuk <tundra@tundraware.com>, freebsd-questions@freebsd.org, Colin Percival <cperciva@freebsd.org> Subject: Re: New != Faster Message-ID: <20070604223021.GA31853@rot13.obsecurity.org> In-Reply-To: <3aaaa3a0706041254r257e1480g872faa6e504df6dc@mail.gmail.com> References: <466451CA.6020108@tundraware.com> <4664572A.4060003@freebsd.org> <3aaaa3a0706041254r257e1480g872faa6e504df6dc@mail.gmail.com>
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On Mon, Jun 04, 2007 at 08:54:50PM +0100, Chris wrote: > On 04/06/07, Colin Percival <cperciva@freebsd.org> wrote: > >Tim Daneliuk wrote: > >> Old 2 PIII @600Mhz 768K 26M/sec 4.11-stable/SMP > >> 50-60 min > >> New Pent D (2 core)@3.2GHz 2G 50M/sec 6.2-stable/SMP > >> 40-50 min > >> Fast 2 Xeon @3GHz 3G 130M/sec 4.11-stable/SMP > >> 8 min > >> > >> Is the difference in speed > >> attributable to 4.11 being faster than 6.2? > > > >Close. The difference in speed is due to the compiler in 4.11 being > >faster than the compiler in 6.2. FreeBSD uses the gcc compiler, and > >between FreeBSD 4.11 and FreeBSD 6.2 that has been upgraded from 2.9 > >to 3.4. The general trend each time gcc is upgraded is that it takes > >2x longer to compile code, but produces code which is 5% faster (as a > >result of "working harder" to find optimizations). > > > >FreeBSD 6.2 is faster than FreeBSD 4.11 for almost everything except > >compiling itself. :-) > > > >Colin Percival > > > >_______________________________________________ > >freebsd-questions@freebsd.org mailing list > >http://lists.freebsd.org/mailman/listinfo/freebsd-questions > >To unsubscribe, send any mail to > >"freebsd-questions-unsubscribe@freebsd.org" > > > > What about all the following observations? > > slower disk performance especially under QUOTA. s/especially//, unless you have further evidence I don't know about. > both of these have been confirmed numerous times by different people > so sweeping them under the carpet and saying they simply not true > would be wrong. My detailed measurements of disk performance and those of others I am aware of contradicts your claim: 6.x equals or outperforms 4.x on disk I/O (depends on driver) and filesystem I/O. The only true part of it is the "under QUOTA" part, which as you know from past discussions, is still under Giant in 6.x. As you also know, there is a patch to address this which is awaiting user testing. Have you tested it yet? Kris
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