Date: Fri, 27 May 2005 21:38:30 +0200 From: Arjan Van Leeuwen <avleeuwen@gmail.com> To: Matthias Buelow <mkb@incubus.de> Cc: freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches) Message-ID: <d86b487305052712384da2fbdd@mail.gmail.com> In-Reply-To: <4295153A.9010605@incubus.de> References: <84dead7205052420503fded0e9@mail.gmail.com> <20050525050943.GA64320@xor.obsecurity.org> <42940A81.1030801@incubus.de> <20050525052214.GA76339@xor.obsecurity.org> <42940C87.5000705@incubus.de> <20050525053054.GA76491@xor.obsecurity.org> <4294AB75.9080908@incubus.de> <20050525185427.GB92006@xor.obsecurity.org> <4294CC9A.1000200@incubus.de> <4295153A.9010605@incubus.de>
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On 5/26/05, Matthias Buelow <mkb@incubus.de> wrote: >=20 > >> Others don't see this though, and in other cases it was *definitively > >> proven* to be caused by the issue I mentioned. I'll have to think > >> more about what to try next..thanks for running the tests. > > > > Perhaps it's something SATA-related? >=20 > Before restoring my 5.4 dumps after testing -current, I installed > fedora3 linux just to verify it isn't somehow the hardware itself. Ok, > plain installation from CDs, kernel "2.6.9-1.667smp" (default > installation kernel). There was absolutely zero noticable lag or any > effect on response time on X11 while untarring the same firefox source. > So there really seems to be something foul in FreeBSD in that regard. > And now for the dumps.. *sigh*. I have the same problem (and have had it for a long time) on both my dual Xeon 550MHz and Athlon XP 2000+ machines. I'm running 6-CURRENT (perhaps this thread should move to the -CURRENT list). I'm working on the dual Xeon right now, so here are some data points from that machine: - I only see it when there is heavy file activity, for example untarring firefox or untarring X. Probably because these have a lot of small files. - I do not see it when compiling world or doing other compiles - I don't have any shared irqs. - I don't have an excessive amount of interrupts, not on the USB irq nor on any other irq channels. I think I remember someone (Scott? Jeff? Don Lewis?) mentioning the problem on another mailing list, and noting that it is a problem with the filesystem that is difficult to fix. I'll try to find that post. Arjan
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