Date: Tue, 17 Jul 2007 21:55:00 +0300 From: "Abdullah Ibn Hamad Al-Marri" <almarrie@gmail.com> To: "Jeff Roberson" <jroberson@chesapeake.net> Cc: lveax <lveax.m@gmail.com>, current@freebsd.org, Claus Guttesen <kometen@gmail.com> Subject: Re: ULE/SCHED_SMP diff for 7.0, buildkernel & thanks. Message-ID: <499c70c0707171155w318ece06j88f31bc19de8776b@mail.gmail.com> In-Reply-To: <20070717114147.J92541@10.0.0.1> References: <20070716233030.D92541@10.0.0.1> <b41c75520707170318r2152b9f0l8d2ec7ea592fe450@mail.gmail.com> <469CACEC.1000103@freebsd.org> <b41c75520707170618o4106de94g57e60d2c93a68329@mail.gmail.com> <576dcbc20707170624kb671fe4ia5ddac21af93eccd@mail.gmail.com> <b41c75520707170636u116aa48fr99dfacc11945c922@mail.gmail.com> <20070717114147.J92541@10.0.0.1>
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On 7/17/07, Jeff Roberson <jroberson@chesapeake.net> wrote: > With regards to buildkernel times; I do not want to sacrafice performance > on other benchmarks to improve buildkernel. The problem is that 4BSD is > as agressive as possible at scheduling work on idle cores. This behavior > that helps one buildworld hurts on other, in my opinion, more important > benchmarks. > > For example: http://people.freebsd.org/~jeff/sysbench.png > > ULE is 33% faster than SCHED_4BSD at this mysql test. This is a direct > result of prefering to idle to make more efficient scheduling decisions. > ULE is also faster at various networking benchmarks for similar reasons. > > I also believe that while the real time may be slower on buildworld the > system and user time will be smaller by a degree greater than the delta in > real time. This means that while you're building packages you have a > little more cpu time leftover to handle other tasks. Furthermore, as the > number of cores goes up things start to tip in favor of ULE although this > is somewhat because it's harder for even 4BSD to keep them busy due to > disk bandwidth. > > Thanks everyone for testing. Can someone confirm that they have tested > with x86 rather than amd64? I will probably commit later today. > > Thanks, > Jeff Did you compare it to latest Linux fixes? is FreeBSD + ULE + MySQL still faster than linux? -- Regards, -Abdullah Ibn Hamad Al-Marri Arab Portal http://www.WeArab.Net/
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