Date: Tue, 18 Sep 2007 03:01:00 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: karol.kwiat@gmail.com Cc: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, freebsd-questions@freebsd.org Subject: Re: Building a new workstation - dual or quad-core CPU for FreeBSD 7? Message-ID: <46EF234C.3060908@FreeBSD.org> In-Reply-To: <46EF1624.1050006@gmail.com> References: <26ddd1750709141351i3646e9bdg8d8b7e93461167f9@mail.gmail.com> <bef9a7920709141441r5c228a8bu1fcf2ea15868c3c@mail.gmail.com> <26ddd1750709151014x2112b022r9bcb999fbf1e7e49@mail.gmail.com> <46EC270A.3020100@FreeBSD.org> <8cb6106e0709151421h7bfdeb6fo7dc671820294e9c7@mail.gmail.com> <46EC4F59.7070104@FreeBSD.org> <20070917084559.K71196@wojtek.tensor.gdynia.pl> <46EF1624.1050006@gmail.com>
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Karol Kwiatkowski wrote: > Wojciech Puchar wrote: >>> Yes, 4BSD is still the default, although you definitely want to use >>> ULE for performance reasons (NB: only on 7, dont use ULE on 6). I >>> don't know whether the release engineers plan to change that default, >>> but I will check. >> could you point to some URL/explain what's the actual difference. > > You may want to check Jeff Roberson's blog site. Kris posted some graphs > on his site, too. Since it's about CURRENT, some results might be > outdated already. Unfortunately my graphs are offline (the machine that was hosting them is being shipped trans-atlantically). There is still a pdf in www.freebsd.org/~kris/scaling though. It is slightly out of date: thesedays peak mysql performance is about 10-15% higher, with no scaling bottlenecks in the kernel on 8 CPUs (i.e. mysql itself is the only thing unable to scale to high loads due to bottlenecks and contention in the mysql userland code). postgresql performance is about 20-25% higher too (and 50-60% better performance than mysql). Some of these improvements come from work that will not be committed until after the 7.0 branch though. Kris
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